OK, here are some recommendations for you
'The ARRL Handbook for Radio Amateurs' (new editions yearly)
This resource keeps getting better -- apparently, someone at ARRL listens.
'The ARRL Operating Manual For Radio Amateurs'
This will be the most up-to-date reference for operating as a ham. Very broad coverage of the hobby with good depth: basic and advanced practices, FCC rules, etc. Even an experienced ham would find this useful when moving into a new part of the field.
I'll mention, but I hesitate to recommend, William I. Orr's
'Radio Handbook'. These were once the gold standard, but are a bit dated now. If you can pick up one published in the mid-90s (22nd or 23rd edition, say) for a few bucks at a flea market, it's worth having on the shelf. Orr wrote other books. Watch for his name.
Also be on the lookout for
'Six meters: A Guide to the Magic Band' -- by Ken Neubeck
A pretty thorough guide. We're at a solar minimum now, so things only get better from here on 6 meters.
The traditional ham attitudes and spirit is in HF now. It's a broad hobby, but if you're interested in HF, study antennas and propagation:
'Everything You Forgot To Ask About HF Mobileering' -- by Don Johnson
Don Johnson is the originator of the 'screwdriver' power tunable antenna.
If you can find a copy of the CD
'WorldRadio 2000 Archive' from WorldRadio magazine you'll be in good shape. It's got some of Don's previous work, some other books, and magazine articles as well. Try
Doug Huston's page
also:
'The ARRL Antenna Book' (an excellent reference)
'Antenna Design: A Practical Guide' -- by George J. Monser
'The Friendly Ionosphere' -- by Crawford MacKeand
'The New Shortwave Propagation Handbook' -- by Jacobs, Cohen, & Rose
Sadly, I have to say don't bother with the
ARRL Repeater Directory, it's inaccurate and out of date. Everyone uses the internet for repeater info. It's also inaccurate and out of date.