Do whatever you are comfortable with
I sat up one night over christmas and did 20 bets in under an hour including time to enter my details for registration. Made £200 profit. Rinsed my exchange out at the exchange
Word of advice!! Never, NEVER chase after money. If you ever find yourself thinking about doing an overlay on a sure football bet, or laying a horse with three legs without backing it first give yourself a hard slap. Stick with regular small profits and you'll find yourself very wealthy, very quickly. The more you earn, the more you do, the more you earn....
Stick to the sign ups, build up your exchange. Open a second account and repeat. Then start on the horse reloads (2nd place)....then move onto williamhill high5s.