Hi, search for old editions of the ARRL Amateur Radio Handbook. These have loads of useful information. You can also look for old versions of QST from ARRL. There are a lot of projects that you could build or learn from.
You can also contact ARRL directly and ask for resources.
ARRLWeb: ARRL Home Page .
Check out AARL's RF Amplifier Classics, (ISBN: 0-87259-931-0)
Hope this is helpful.
Wayne
KB5UQ