Hello tlj825 and welcome to Aces High.
Your landing gear will not go down if you are going to fast.
The same can be said of some planes with flaps. Some aircraft have maneuvering flaps that can be lowered at higher speed than normal flaps, to name a few the P51D, P38 and there are more.
Visit the Training Arena and ask for some help. I'm a Trainer and try to spend time there every day, along with my fellow Trainers.
We can't be there all the time but some people will help if you ask questions. The main arena is not the place to be asking how to start your engine and how to drop bombs, that's a fighting arena.
Two good references are the Aces High manual, available at the download page, and the websight
http://www.netaces.org ,which has basic to advanced information on the game. You can look those over when you have time.
I hope to see you in the TA [ Training Arena ]