If you lube the cables when you buy the bike, the cables will last a long time. I had 16,000 miles on my G5 and the clutch cable looked like new. The throttle cables didn't get lubed and made it to about 12,000 miles. The replacements got lubed. I use Dri-Slide.
The stock chain is garbage. Replace it before they ruin your sprockets. The stock battery seems to be a bit short lived. Get an AGM. I replaced mine before it was 3 months old. It was a good thing too. I layed the bike on its side and it stayed there for 24 hours. If I'd still had the wet battery in it, it would've leaked acid all through the middle of the bike and destroyed it!
A little ACF-50 sprayed will on it protect it from rusting. They are somewhat susceptible to this!
Blue Loctite should be applied to most or all the nuts and bolts. The bikes stays in one piece a lot better!
Now that all the bike prep is done, you have a nice reliable machine to have a hell of a good time on!
Check your shifter and make sure you can easily shift it up and down with the same ease. If it's off one way or the other, pivot it around the shaft until it's right. It will miss shifts a lot less. It's a good gearbox, but it does take time to break-in, and for the two of you to get used to each other.
If you have Skid Master Avons, you might want to look for some tires that offer traction! The truck tires tires that come on the G5s and, I think, B5s are pretty crappy.
Bare