hey wheeliepop
i am by no means as experienced as most of the guys here but below is what i found from my own experience with my '81 prolink with the help of all the guys in the club. these are in no particular order:
any tires other than stock size may cause your bike to sit on the side stand funny. i went with the S11's. as someone said it is enough tire for these bikes.
turn your petcock off on your tank to avoid hydro-locking the #1 cylinder. UNLESS you are absolutely sure your auto petcock is working (or nobody has already removed it)
don't start your bike over winter storage UNLESS you are going to ride it awhile. condensation will occur in the case and you will get water in your oil. don't ask me how i know this
don't mess with the carbs unless you know what your doing. these are VERY finicky and the heartbeat of your engine. there is a great write-up by mike nixon for "on bike carb cleaning procedure" that worked great for me. when your shooting the fluid into the openings wear eye protection, it tends to spray back at you. don't ask me how i know this EITHER
if your doing any de-greasing and metal prep for painting etc. i use POR15's marine clean and metal prep. the stuff is AWSOME! also used the POR15 heavy duty tank kit and love it, stripped out the old kreem and have a beautiful finish inside the tank now.
i got myself a small mountain bike suspension pump that has an on-board pressure gauge for tweaking my suspension. DO NOT use a gas station air system for example.
and the #1 piece of advice i was given??? "ask lots of questions. these things can get expensive if you head off in the wrong direction too many times."
judging by the number of bikes you already have a lot of this you may have already experienced or know. just some things i discovered in my own journey with this machine. have fun with it!
kent