That kit looks like it should give you a pretty good start. Assuming you have the basics like sanitation and process down pat, probably the most important thing to work on as a next step is fermentation temperature control. Like someone (can't remember who) always says, "boiling, hopping, etc is just putting together the ingredients but fermentation is what actually makes the beer". Or something like that anyways. Most folks starting out allow the temps during fermentation to get too high so working on doing something about it would be the best bang for the buck.