Andy replies:

Get a copy of the ARRL handbook or, even better, the ARRL
Antenna Handbook...

You have a lot of getting up to speed to do before you will
actually accomplish anything. Once you understand the basics,
you can do almost anything with coat hangers. Otherwise, you
will only create bent up wires that may or may not work at some
frequencies and not at others...

It ain't black magic --- antenna design has very definite rules
and they are not difficult. It's a lot like hanging sheet rock. If
you understand what you are doing, it is easy. If you don't , you
have a mess.... good luck...

We all started just the way you are now. You may find that
it is a hell of a lot of fun. Or you may decide, "the hell with it".
But there's no reason for "trial and error" when the actual discipline
is very methodical and reasonable....... about the complexity as
changing the oil in your new truck for the first time....

Andy W4OAH