Re: pulling to one side on initial application of the brakes - could be
that one side had gotten wet or the other side had been wet and rusted a bit.
If it went away by itself that is a good sign unless it does it again.
Could even be that one piston was a bit stuck at first but popped out.

Since pulling to one side normally is a front wheel problem it might be good
to make sure all your bushings, rods, joints, etc are in good shape too.

Rear brakes need brake shoes and I don't see a really big difference in them
but would avoid the cheapest. You will almost certainly need a puller to
get the brake drums off. They can be real boogers. (Cherokee Indian term)
--
George Downs Bartlesville, Heart of the USA!