This article is from the Beginner Motorcycle Info FAQ, by firstname.lastname@example.org (Ravi Narayan) with numerous contributions by others.
1) Buy same chain lube right away. You have to put it on your
chain every 200 miles and those miles will accumulate quickly.
2) You can accessorize until your bank account is busted, I
won't advise you on that. One (I think) necessity is a bungee net
for carrying those objects one inevitably picks up in the course
of a day. You can get fancy and more expensive options (tank bags
3) When your bike won't start, check first that the three most
obvious things are in the operating position (kill switch,
sidestand, fuel petcock) before running for the manual. Yes, we
have ALL at one time or another sat scratching our head trying to
start the bike and then found one of these in the off position.
4) You can keep your bike shiny new and prevent rusting by
covering it at night and giving it an occasional polishing (as well
as cleaning) with a scotchbright nylon pad and a little Mother's
aluminum polish or Turtle Wax Chrome Polish. Besides appearance,
it helps with maintenance, rusted parts can be a bitch to remove.
5) The fork lock on the ignition can be easily broken, if you
value your ride consider a kryptonite lock or other protection.
6) If you ever plan to not ride for 2-3 months (vacation,snow) you must
properly prepare you bike for storage in advance or
else you will have some nasty stuff to deal with upon your return
(ie. an inoperable bike) I won't go into all the details of
removing batteries, draining tanks, etc here, just be aware that
you need to find out the procedure before winter/vacation. A
battery charger is a good investment if you will need it to do this,
it will pay for itself quick.
7) Always be courteous and wave to other cyclists on the road,
even if they ride brands you hate. Oh yeah- and as Honda says on
their gas tanks "preserve nature" 8-)