I have 2 questions. One, is a mechanical issue that I know is my fault but would like help correcting it

Whenever I'm flying, and especially coming in to land, I find that I'm a) too high, and b) too fast. I always have the flaps to full (when landing), and usually have the engine at idle, but, can't seem to slow down without going higher. What am I doing wrong? (And, I know it's probably hard to answer that without seeing me do it, but, I don't know if that is possible lol) I've noticed it mostly in the jet mission (first learning mission with the jet, where you take off and land a half hour-ish later, I can't recall the name right now, sorry)
Second question. I would love to fly into my home town, and would like a better looking airport. I have done searches online, and cannot seem to find a decent redone texture of Lansing airport (LAN). Any suggestions? Thank you all for your time and help with the newbie. I'm lovin it so far :D