Tippet versus leader: It could be perceived that they are two separate entities but, in the beginning (at least), they are one piece of material. The tippet is basically the skinny end of the leader which you tie your fly to. When you first purchase them, most (if not all) leaders taper down and "consummate" in a skinny tippet. As time and ties/reties add up, your leader/tippet will become shorter and shorter and, unless you want to replace the entire leader/tippet, you can tie on new tippet material to extend the length and the life of the leader. If you fish around a LOT of vegetation and algae, however, any knots between the fly and the line will tend to grab onto pieces of algae and plant life (which can be really annoying) so I personally don't like that extra knot. Even if you DO use replacement tippet material, after awhile even THAT will shorten the length of the leader (after enough reties) and EVENTUALLY you'll need to replace the whole leader. But it's all for the sake of the game.
Bass and, especially, bluegill are not all that sophisticated and each will USUALLY take fairly simple offerings-with bass just requiring (sometimes) larger versions than the other. For bluegill, I like spider flies and poppers a lot. For bass-i like larger poppers and grasshopper imitators. I mostly fish the top surface film so I'm less qualified to speak on subsurface offerings but there are subsurface flies (such as wolly buggers) which will work for that.
One of the blessings of these two fish is that they do not seem to mind when a fly or popper makes a loud "splat" on the surface-in fact, sometimes the fish seem to WANT some noise. I'd avoid it with the line itself but with the fly, it is isn't critical. This is especially convenient for beginning fly fishermen.
For the MOST part, the reel is mostly to hold line. The majority of the time, you will take in and feed out line through your fingers. A larger fish may necessitate and/or "allow" you to use the reel in a manner more customary with other types of fishing but don't think you HAVE to reel from the reel (if that makes sense). Having a LOT of extra line in front of you or in loops can be a pain but you will get a knack for knowing how much line to strip out and take in.
ENTIRE volumes have been written on the subject but these are some thoughts.