Here
you will get a few answers and a few advise.
Aviation design could be simple... Let's see if we succeed in showing
you in a simple way how to design an airplane (model or full-size).
A word on your goals
First you need to know what you want to achieve. Therefore it is
important to know what is necessary in a certain type of airplane. Once
you decided what the goals are of your design, you need to search a way to
achieve them.
The forces
To understand how you can achieve your goal, you need to have some
basic knowledge of the forces on an airplane. Here I will try to explain
what lift is, what types of drag there are. Once you gained that part, you
will be more able to understand the basic wing design.
Basic wing design
Here you will see how performance changes when changing the form of the
wing.