Here is no rules about summ of money you should have for your fisrt investmets. The main thing you should understand that you can lose them also
Great, how much investment does not matter. It is important that we prepare the psychology that we can lose everything. Investing in crypto is not a betting game, so invest some money that you think is reasonable. When I started investing in crypto I invested 2500$ and after a month I only 1100$. It's pretty bad but I still get through it