Minimum stakes worth playing - 25NL?

I take what I said back ^^^ this is better advices^^^

deposit whatever, really

but don't jump straight into 25nl cos it doesn't make a whole bunch of sense
if you're good enough to beat 25nl it won't take long at all to make 10bi at 10nl. Start at 10nl, move up once you've made 10bi (that's 4bi at 25nl) and move up with a 6bi stoploss. You'll be playing with confidence and the rust will be gone, those things count for a lot.

If you start at 10nl and lose 10bi, well, move down to 5nl and be glad you didn't start at 25nl.