Staking
I would advise against changing stakes too much as inevitably you win the small ones and lose the big ones. I would also advice against any kind of cumulative or chase your losses staking plans. I think level stakes is best and gradually increase your stakes as you build your bank and confidence in what you are doing.
Betting Accounts
Open as many betting accounts as possible. I also recommend opening accounts on the betting exchanges Betfair and Betdaq as you can often find better prices available there.