With betfair poker you could earn upto $600 sign up bonus, rather than you having to make a large deposit (minimum deposit is $20) betfair are offering you the chance to play and earn. Once you've opened your account and start playing you will be earning bonus points from the first hand you play, betfair pay the bonus in increments of $10 every wednesday, if you're a betfair sportsbook user you can benefit even more from this as the points you earn will also go towards reducing your commission rate on the sportsbook betting exchange.
Betfair operates single table and multi table tournaments, if you're just starting out the single tables are for you as you can buy in for as little as $3 and you limit your loss to your buy-in amount, whereas the multi table tournaments are for the big players who enjoy pitting their wits in the big games where there could be thousands of players competing over many tables for big cash prizes.