When playing with new rubs it's a good idea to keep the quantities small, keeps the cost down as well. Try and break down the recipe to it's smallest amount, ie. teaspoons, 1/2 t, 1/4 t, and even 1/8 t. Mix it up and try it out. Make sure you write down each version too so you can go back to your recipe later.
But don't just do a taste of the rub "dry", put it on some chicken legs or thighs. Try each rub on 1 or 2 pieces of chicken, pork chops/country style ribs (to get the pork flavor only). This ought to give you a nice sampling of your 'rubs' and how they taste cooked.
Same thing with the sauces.
Mix and play around with your rubs/sauces until you get the combination(s) you like.
Remember, practice, practice, practice.