Bad. As others have said, you should probably just do the program Wendler wrote as he wrote it, no added assistance day, keep the supplemental work (second lift) the same as the main lift, and adjust the assistance work.
Regarding 5x10 work, though Wendler has noted somewhere that you can switch the lift (e.g., 5/3/1 Squat then 5x10 Deadlift), he very clearly usually recommends sticking to the same lift (e.g., 5/3/1 Squat then 5x10 Squat). In fact, here is what Wendler wrote yesterday on a different thread of this forum for someone (and this seems to be his go-to recommendation):
“FSL” is first set last (i.e., using the first work set’s weight). The 3 categories are push (pushups, dips, db press, or tricep pressdowns, etc.), pull (chin-ups, facepulls, curls, etc.), and single leg or core (ab work, lower back work, lunges, etc.). In general, pick one exercise for each category to do 25-50 reps (number of sets for that will vary).
That is a good program and you will get stronger doing it. There is not really reason to go more complicated than that at this point in your training. Since you are new to the program, I would suggest just doing that for the next 3 cycles, then you can try a higher volume variation like Boring But Big, Hardgainer, or whatever (again, just doing it as written).