Starting a bank roll.

Hey guys im about to deposit $50 into Full tilt poker. I'm mostly a SitNGo player but im looking to build a steady bank roll. i was thinking something along the lines of this -
$0-$25 - play $1 sngs
$25-$100 - play $2 sngs
$100-$500 - play $5 sngs
$500+ - play $10 sngs ( my limit )

anyone have any advice?

also any tactics for sit n go tournaments will help as well.

i usually just lay back at the start wait for premiums and play em aggressive. once it comes down to final 4 i usually like to play wild.

thanks to all :]