Some steps to take in the thirties, many have been mentioned before:
1930
-Have some accidents happen to this weird mustachioed Austrian and his friends.
-Point with alarm to the Soviets.
-Start to motorize the Versaille treaty(VT) authorized divisions, but no Armoured Cars as that was illegal under VT. Standardize the trucks & loose the horses.
-Use the new purchasing policies no more Cost +.
-Start experimenting with rocket art. not mentioned in VT.
-Start work on improving the equipment of the troops, things like camo, tents, radio's and first aid kits.
-Start a research program for new firearms, rifles, pistols, MP's, and machineguns.
-Dump the secret cooperative agreement with USSR, replace with similar agreement with China and/or Finland & Sweden. Still illegal but at least it won't bite you in the ass in 11 years.
-Force an upgrade on the rail, road, and water infrastructure networks. Make them job programs, with the high unemployment this is gold. Also start mass-producing new locomotives and riverboats.
-Have Austria annex Germany, only the reverse was blocked by the Paris Peace Treaties(PPT)(yes I have read art 88). This is very difficult but totally awesome diplomatic move. ie have referenda in Germany approving the annexation by Austria. I think this is the time to do it as everyone is distracted by the depression.
-Start a proper geological survey of Germany/Austria. Force through a profitable minimum purchase price and guarantee of purchase on strategic resources mined in Germany/Austria. Sell it as an other jobs program.
1931
-Silence Carl von Ossietzky
-Mechanize the Pioneer company's, think bulldozers, digging machines, bridging equipment, and railway laying equipment all on tracks. Assign them to the infrastructure program. But remember no armour on these vehicles. Add civilian construction companies with remarkable resemblance to the Heer construction units.
-Start work on new artillery r&d.
-Start working on AC, Pz., ShützPz. & JägdPz. vehicle designs.
-Start work on proper encryption & decryption, and communication protocols.
-Start up the sniper school
-Start up the jäger schools both mountain and regular.
-Send the first group of "tourists" to China.
1932
-Do the staff work for expansion from PPT size (15 divisions) to 100+ divisions.
1933
-The new firearms and field equipment should now be at production prototype stage. Freeze the models when ready and start mass production.
-Start building the barracks and training facilities for an expanded army.
1935
-Ditch the PPT size limitations like OTL, but make all new divisions motorized and at first only regulars, if for shorter terms than under the VT. So 36 mot.inf. divisions now.
-Start production of armoured cars.
-Train the new inductees to become corporals as opposed to the Reichwehr men who were trained to be sergeants+.
-Win the Saarland plebiscite like OTL.
-Tell the KM that even thinking about breaking or cheating the new AGNA will result in them having a torpedo shoved up their asses and there will be no lube.
1936
-Reoccupy the Rhineland.
-Freeze and start production of Pz., SchützPz., and Jägdpanzer. A medium Pz. Mark IV look alike with sloped armour and two types of turret/gun, an long barrelled AT and a short barrelled HE. And a light Pz. something alike the Pz. II but somewhat larger, with both the SchützPz. & Jägdpanzer to utilize the same chassis and parts. If at all possible have the Jägdpanzer use the same ammo as the AT mark IV.
-Sell and or licence the Jägdpanzer PzII+ and other defensive arms to the smaller neutrals.
-Freeze and start production of artillery.
-An expedition to Spain might sound good, but its better if you just fight the commies in China.
1937
-Start conscription.
-New divisions won’t be motorized because of fuel concern, but if at all possible make them semi-motorized.
-Start upgrading some of the Mot. Inf. Div. to Pz. Div. as equipment becomes available.
-Make sure that the FJ are under Heer command.
1938
-Sudetenland including the Skoda factories but not the rest. While the addition of the Czech army’s equipment would be nice, the better production should allow you to equip your divisions. Have Poland and Hungary gang up on the remnants to take the PR blame instead of you.
-Not taking the rest of the Czech lands might give you the last freebee to take Danzig and Silesia instead.
1939
-Join the international coalition to attack the dastardly Italians. Take back any Germanic lands but stay away from the Adriatic coast.
-Don’t declare war on Poland, France, UK, NL, BE, DE and Nor.
-Ask for your African colonies back as the allied occupiers are screwing over your people.
-Send massive supplies and volunteers to Finland if the Soviets invade.
-Organize a defensive alliance in eastern Europe against the Soviets.
For extra bonus points and lolz:
-Secretly encourage Italian military adventures in the Balkans.
-In the event of having some extra cash, accept the offer to buy back the 3 districts from Belgium. Just to see if Paris can self-combust and go all crazy on Belgium.
-Then offer Italy the same deal for lower Tirol, and watch as the Italian political scene goes bonkers. Between the greed and national pride I doubt they will ever manage to make a decision.