You are clearly the author of many cunning plans, Kolias. Stealing a time machine from your smartypants neighbor is perfect.
In terms of getting cash for starting your evil deeds in the 1930s:
Gold in real terms (economics-speak for inflation-adjusted value) is not quite at its historic peak right now, but it is close. However, you don’t need to care about that. Go back in time wearing a piece of decent jewelry that you own (or steal, since you’re being Evil) and sell it for your initial capital once you arrive. Then invest that capital in something that will grow in value through compound interest as well as inflation. With 80 years to grow, your money will about double.
Other quick-money time travel antics: sell that jewelry for enough cash to go purchase a painting by one of the great artists when s/he was still alive. Van Gogh comes to mind because he was prolific and broke most of his life so you could get a real bargain. Then bring it back with you to your own time and sell it at auction.
Another one: go back to the 1950s and buy up most of Central Florida for cheap. Sell to Walt in 1960s.