Welcome and congrats on your fine choice!
Best advice I can give you is spend a bunch of time going back over the last few months of posts on here to get the lowdown on most of the good and bad mods.
This is a new bike and consequently, all the info is new and fresh. We all have different ideas and enjoy sharing them.
This is a very friendly forum, full of new and experienced riders, you will not feel out of place.
With regards to seating...quite a contentuous item right now as several members have bought the Corbin, which is the only actual seat replacement available, and the quality has been piss-poor.
There are a few covers available, I have a set from France. I don't find it too uncomfortable and can go tank to tank fill no problem.
You will not be disappointed though. It is a great bike.