Spare Ribs Brine Mixture Needed

I think a problem with putting the bbq sauce on that early is they usually have sugars that would burn during a long cook, thats why its best to not sauce ribs (with a sugar based sauce anyway) until the end of the cook.

If you are smoking, no brine needed.

4-5 hours at 250, sauce last 20 or so minutes with sauce of choice, or serve sauce on side. Hickory, pecan or cherry for the wood. Smoke for first 90-120 minutes of cooking time.

Use a little yellow mustard to help rub stick.

Use rub of choice. There are many prepackaged rubs that are pretty good, or tons of them on the web...just search and find one that matches your tastes.