Jenna, I’ll try to tackle this although I’ve never used BF, I’ve just looked briefly at the booklets.
OK. Sonya’s lesson plan books. These are very nicely done; they have readings, assignments, projects, etc. all in a daily schedule format. You open them up, and do what is scheduled to do that day. They do use the recommended books here at SCM so you’ll need those books, also, to complete the plans.
Truthquest is completely different. It is a list of books by historical topic, accompanied by commentary. NO daily lesson plans. There are LOTS and lots of books listed, and the idea is that you choose one or more for each topic, read the relevant commentary and read the books, but you are pretty much on your own as to which book, how long to take reading it, etc.
Beautiful Feet has chosen certain books, and then built some simple teacher booklets around them. You read the books and there is some material in the TG but it is pretty simple, at least the ones I’ve seen–some questions, etc. If you really wanted to use the books in the BF program, that would be good to also use the entire program, but if you aren’t totally wedded to the thought of THOSE books and no others, then I would just not worry about it.
Now. You do NOT need to use more than one of these. In fact, unless you had a very specific reason for wanting to combine them, I would not recommend it. No need to unnecessarily complicate your life. There are threads here from people who go about educating CM style in various ways and using various resources; just because it’s talked about here doesn’t mean everyone needs it! Some people just really, really want to use, say , TQ. I don’t at the moment, I don’t use BF, and while I’ve used Sonya’s nicely done booklets, I don’t use those all the time either. I have books I like for most history periods, already, after our several years of homeschooling, and I have notes on what I’ve done previously so I just mostly use those and the books I already have. Beware of Curriculum Envy Syndrome, the odd desire to use every curriculum you hear someone talking about. 🙂 Better to prayerfully pick one thing, use it a while, and only tinker if you really feel led to do so.