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
When you make investment it is not necessary how much you are going to invest as long as you can afford to make that investment. But the question is, are you willing this amount to lost? So, it is better to invest with enough money to start with whatever happens. Investors usually enter in the business for the amount they are willing to lost.