If you're planning on adding any plants, you'll want to get a CFL (compact florescent) with a color temperature of around 6500K (Kelvins) to mimic sunlight. They run cooler, too. If you're not adding plants, get it anyway. It's like watching your fish on a sunny day.
As for cleaning the tank, you might try this:
The keepers around here recommend two water changes per week for a 2.5g: one 50% and one 100%.
I, personally, don't like removing my fish, so I do two 50% with vacuuming, plus daily (or so) spot-cleaning with a turkey baster.
Also, none of my business and I know you didn't ask, but many of us feel that white gravel is glaring and stressful for fish. I know it looks good, but....
Welcome to the forum.