The step satellite involves a series of exactly 6 sit-n-go's satellites. The top money finisher of each level goes on to the next level, or else a chance is given to them for repeating the step depending on the payout structure. The last but not the least step can make you win 1 to 3 entries in huge events like European Poker Tour or even the WSOP.
You can simply choose the step from which you want to make a start and the best would be step-1 in which each buy-in costs as low as $7.50. You will require atleast 30 buy-ins so it sums up to $225 only. Alternatively you can start from step-2 which costs you $810 for 30 buy-ins. Now because you are getting next level tickets on winning we would suggest that you use your entire bankroll in the first level or the level with which you are starting. With 30 buyins you can play step-1 for 30 times and collect many tickets for the next level. This will help you to increase your confidence and also to test yourself.