My troops are slow, they die off easily,
Their are six potential reasons for these;
1. They're in a province with a life rating below 20 and are thus suffering natural attrition from the environment being unhospitable OR being in an uncolonized province, which have natural attrition regardless of life rating.
2. They're facing enemies with superior arms; regular troops will be curbstomped by Artillery troops and decimated by Tank troops.
3. They're in enemy controlled provinces they have'nt taken over yet.
4. They're isolated, either on a literal island with the enemy ocupying the sea provinces around it or the metropoles coast thus preventing shipment of supplies or are in a non-productive province that's surrounded on all sides by enemy controlled provinces.
5. Infrastructure (Railroad) level; troops move faster the more infrastructure the provinces have, so for example it may take several game weeks for troops to move from point A to point B when their's no infrastructure, yet only take a few game days when the same route has alot of infrastructure.
6. The size of the provinces they're moving from and to also affects the speed, so for instance, it'll take longer for troops to move between the large provinces of Brazil than it would between the smaller provinces of New England, even if they're all at the same infrastructure level.
there aren't enough guns to go around apparently.
When making troops you have to specifically choose the equipment they'll have, so if you just open the troop building menu, set the number to 10 and say build, they won't have any equipment and will be easily defeated by enemy troops with equipment, you have to use the drop down menu to choose what kind of equipment they'll be equipped with, ranging from (but not limited to) Artillery to HQ units to Tanks.
I'd be fine if I weren't limited to raising 10,000 soldiers, waiting 7 months, raising 10,000 more, waiting 7 moths, and so on. It takes too much time to get my forces in order.
Unless you're playing as China, Russia or one of the Empries that's militarized a large chunk of its population, you should'nt be able to create that many troops that often, so I'm not totaly sure what you're meaning here.