Well, first of all, there's probably not going to be much of a civil war. Without the ideological titans that are Lenin and Trotsky, riling up enough Bolsheviks to win is going to be harder. There will be an uprising, of course - when exactly I'm not sure, but if I had to guess, it would go down the same way the failed revolution in Germany did. Lots of grievance and trouble, with little immediate effect... But before that, the actual bear in the room needs to be addressed:
The biggest wildcard here is whether or not the treaty of Brest-Litovsk occurs. If it doesn't, Germany will be even more overstretched - as even though the Russians basically collapsed, they weren't completely gone, and that big fat frontline has to be maintained somehow. The treaty OTL gave them some breathing room to redeploy troops to the western front. If the Russians keep fighting, even barely, this doesn't happen, and chances are that WW1 ends a few months earlier as a result. With Russia this time being on the "winners table".
OTL Imperial plans for peace involved, well, basically pushing the boundary of Germany to it's 1945 borders. Now, of course, it's a question of whether or not they could actually achieve this, and I'm pretty sure the other powers wouldn't let this happen, particularly the British (they wanted Germany weakened, but butchered lest the others grow too powerful). Germany, however, is going to come out of that with something at least as bad as the treaty of Versailles. And that means that attempted revolution led by Rosa Luxemburg might just succeed... A Central European USSR? That would be quite a thing to behold.
Russia, on the other hand, would fall strangely into a situation not too dissimilar to post-WW1 Germany except they won except skipping right past the somewhat liberal and dysfunctional stage straight into mild Hitler mode. They've won, but at a bad cost: the tsarist mismanagement ended in catastrophe, and then to think that the leftists wanted to sink the ship entirely? That antisemitism prevalent in the country would head into overdrive - now Kolchak, Denikin et al. who are bound to take the reigns basically immediately are no Hitler, but their immediate move will be to basically deport all of Latvia into Central Asia or Siberia or wherever. Any group viewed as disproportionately Bolshevik, which is basically everyone not "Russian" in the expanded sense (incl. Belorussians, Ukrainians, etc). This purge won't last too long, though - nothing like the Soviet comical levels of terror. No economic blunders either. Still, it will sour foreign relations with the other powers who are now decided moralists.
What is going to happen is that the rebuilding process will happen faster, and all those half-assed "reforms" of the Tsarist days will be supercharged. The combination of being true winners, but the conservative lethargy and their, well, conservativeness "poisoning" it will produce a weird sort of right-wing progressivism. I imagine Russia in this case would go into some weird form of technocracy to the fullest extent, as this was en vogue across the world at the time. It's good to remember that pre-revolution Russia was a hotbed for all sorts of strange ideologies, such as Cosmism. That's not to mention the fact that there would be no White emigration; all that talent will remain in the country - you'll have a Red emigration instead. And that's the tricky part.
See, the White emigres were pretty important in curtailing the spread of Communism, which was popular across the world - Western countries didn't want to fall into a situation similar to Russia, and the Whites were good examples of what happens, resulting in the many Red Scares... But now, that might just become inversed. Soured by the purges of minorities, leftists and whatever boogeymen Petrograd identified, combined with the Red emigres probably resuming their political activity, you might just get... Communists getting to power in elections, even. If not, a higher chance of revolutions.
Then there's the WW2 question. Germany will still be revanchist, perhaps even more so - but without Hitler to rally everyone into a frenzy, who knows what would happen? My personal bet: with the heightened popularity of the left across the world, and a big vacuum, the Strassers fill it. What happens afterwards is anybody's guess.
There are other unresolved questions: Poland (Russian, but probably at this point extremely unruly) and Turkey. Austria-Hungary is a lost cause, probably ending up the same way it did, except now, basically everything but Austria and perhaps Hungary will instantly fall within Russian influence. The Balkans will as well, no matter what they think. And this raises the question of Turkey. It's going to be quite a a mess this time, because unlike the other powers, the Russians will not take no for an answer. It's going to be the first post-war crisis nearly instantly. If they leave the Turks alone, they will loose their Balkan allies, especially Greece and Bulgaria (though Bulgaria might as well be forcibly integrated into a giga-Yugoslavia). Whereas at least the British would like to keep Germany around for if nothing else to act as a counterweight, at that point nobody gave a damn about Turkey, and wanted to carve it not much unlike the bird. A curious scenario indeed.
Basically, all in all, this ends up being a gigantic Russia wank. Even more so if the Bolsheviks fleeing the place manage to start revolutions across Europe. You just end up with Russia being a poorer, less developed US with much faster growth.
On the other hand, this is very much a post-1900 question.