You send me 2000 credits a month(recurring) and I will guide you step by step.
OR
You choose the tournies that offer credits as prizes,or play match play challenge games against other people,betting for credits.
My original suggestion will be the cheapest for you in the long run.
As for money,actual wonga,its simple,you don't.Everything you do here is for credits only,which when you amass 100's of 1000's,you can exchange for vouchers and gifts.In the meantime,enjoy.
Lizzie