Need help deciding on what lights to get

I just recieved a 55g RR and am trying to decide on what lights to get. I don't want to spend too much, since I don't have a lot of money as a poor high school student. Unless I find some used lights locally that are high enough wattage, I'm just going to stick to fish only with maybe some corals that don't require high wattage. What type of T5 would be cheapest? Retrofit or a fixture? Suggestions? Thanks.
Also what Mag model would I need with a 20g long sump, half of the pipe is 1.5" the other is 1.25" wide? How do you calculate it? Thanks again.
 
Jetskiing put up a great post about lighitng check it out
https://forums.saltwaterfish.com/t/365627/need-help-deciding-on-what-lights-to-get
 
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