I only have 20 euro to invest, I have no more, but I will do it so don't dissapoint me!

i also started with not much money only 50$. Portfolio is worth over 3.000 now so you will be fine
I think a lot of people started with a small amount. Just make wise decisions: DYOR. Read as much as you can on forums etc.
its very risky to start with a lot of money in my opinion
I don't know, I think it depends on how good you know the market. If you do some good research before and study the market it isn't that risky:)