My brother gave me a squat rack. Any recommendations for fitness programs and low cost equipment to add?

I already run, but I would like to incorporate some total body strength training. Just to stay health and build enough strength to be able to stay fit and limber. I’ve got that “Homemade Muscle” book that seems to be what I’m looking for, but want to see if you all have any recommendations.

I’m also trying to figure if there’s some low cost equipment I should add that would help. Like those variable weight dumbells, I think I could afford those. But a full set a weight plates is well beyond what I can afford.