Great advice on cleaning in the first post. I've also substituted cotton balls for the salt to good effect.
It can be a bit frustrating when beginning. Learning on used "estate" pipes like your great grandfather's is actually a very helpful starting point. While you'll likely need to clean and ream many of them, a layer of carbon (and whatever else builds up) helps keep them smoking cooler *Don't ream off all of the coating; it's good!*. New briar pipes can be rather sensitive and burn hot.
I second the opinion to seek out a good tobacconist. It's not essential--we have an internet thing now--but it can save you a lot of headaches, unnecessary, or misguided purchases.
My last piece of beginner advice is to probably focus on a good burnable tobacco while getting technique down. I went straight for the tobacco I was most intrigued with and found myself struggling to keep fancy English and Balkan flake tobaccos lit. I'll shut up now, before I drown out any decent suggestions with unnecessary ones.
But congratulations on the pipes and on taking up the hobby.