How much would you make as first amount? I was thinking £50 bit even if this times by even 10 that's only 500.
Would 300 be a more realistic start
It depends on you. How much money can you risk for an investment? No matter how big or small you invest into something, there is always a risk. If you can't take the risk then start with a small amount of money, but always remember that the riskier it is the more you will earn from it. So yeah, the decision is all yours anyway.