Gelatin can help improve the clarity, but your first step is to use a 2-stage fermentation. (I am assuming that you are fermeting in a bucket and then going straight to bottles from there.)
Using the secondary fermenter (glass carboy) will help greatly with clarifying the beer. If that step alone doesn't get you clear enough, you can add some gelatin to the beer in the secondary a few days before bottling it.
However, I have done the gelatin thing once (just to try it) and was not terribly impressed with the results, but maybe that's just me. It was not really any more clear than my average brew.
I think you are following a good plan, by the way; brew with the kits for a while until you get the hang of things, then start putting together your own recipes and experimenting. I used kits for many years before moving on to buying hand selected extracts, grains, hops, and yeasts.
It's a fun fun fun hobby.
-walker