Enjoy your grandfathers pipes. Feel free to clean them if they have cake. There are methods to remove the ghosting that strong perique and Latikata tobaccos can leave behind. Once you have cleaned the cake, fill bowl with canning salt (pure-no idodine) and pack tight, moisten the salt with grain alcohol or similar spirit and let dry. This can be repeated several times. This will draw out many of the impurities, bitterness, and heavy ghosting. Do not do this to your Meerschaum as they do not ghost, simply clean and smoke. Also do not run the Meerschaum under water. Water softens the stone and weakens it.
Every smoker need a pipe tool they help with cutting the accumilated cake and empting the bowl many have a tamper affixed to it. I use a pipe nail to tamp, I also use a nickle 30.06 case at times. Tip for cigar smokers is to champher the case neck to use as a cigar cutter, so now you have a pipe tamper and cigar cutter.
Be careful when smoking as not to be in a hurry. Many new pipe smokers want to rush the smoke and blow huge plumes of smoke. This is a recipe for tongue bite aka scorched tongue. Try to use a technique similar to gently sipping through a straw. Be advised too that many aeromatics are very moist and can lead to tongue bite easier than say an English blend or a VaPer/straight Va will as the casing has time to dry somewhat. Not true all the time so ymmv. This will also aid in preventing the gurgle of the condensate. If you happen to gurgle keep an absorbant pipe cleaner and run it through the shaft. It happens to me, I tend to produce large amount of saliva and it can find its way into the the bit.
I like Va flake tobaccos. A nice Va is Orlik slices it is a citrusy tabacco that is very forgiving. The full flake can be rubbed out, cut, folded, rolled and folded, ect its up to you. There are ready rubbed versions as well too. I like the rum cased tobaccos too.
Macbaren Dark Twist, Navy Flake and Stokkebye Luxury flake are classics.
Lots of new smokers tend to over fill/pack the bowl. I like to fill loose, light tamp, re-fill, tamp, top-off, tamp. Over tamping can clog the draft hole and make it hard to keep the ember lit and difficult to draw as well.
Good luck! Remember it is more about the journey as opposed to the destination.