Saphir’s Renovateur acts as both a cleaner/conditioner and a polish.  If you are polishing cordovan, I suggest you stop here.  However, outside of cordovan, I would check out Saphir’s cream line (wax is just too ’80s Wall Street shiny).  Also, with respect to brushes and other accessories, Kirby Allison’s starter kit will give you a good idea as to what you need.  Keep in mind, though, that Kirby is trying to make a buck, so much of what they are suggesting is probably overkill.

As per technique and anything more specific than that which I have discussed above, I defer to Nico and Ethan, seeing that they know well more than I do about shoe care.