Welcome! Our Cougar is very similar to the Premier that you're looking at. Hopefully, you'll enjoy it as a much as we've enjoyed ours.
This Forum has tons of information buried in its database. Get to be good friends with the search function and you'll be surprised how much you can discover.
In case you're not already familiar with towing, there's more to calculating what trailer you can tow than just using tow capacity of your TV (tow vehicle) and the dry/shipping weight of the trailer. You may want to run it by this calculator just to be sure you're aware of everything involved:
http://changingears.com/rv-sec-calc-...eight-tt.shtml.
This site can help bring you up to speed on the basics of the 12V system on your trailer:
http://www.marxrv.com/12volt/12volt.htm
Here's a quick overview of RV plumbing I found. It's a bit different than household plumbing, but there are some similarities:
http://www.rv-insight.com/RV-Plumbing.html
Remember to carefully read the manuals that you receive when you take delivery of your trailer. It's boring and tedious, but it's the only way to know how you *your* trailer works, since it's different from everyone else that doesn't own the exact year/make/model as yours. The owners manual is usually pretty generic since it's written to cover all of a manufacturer's models, but you should also receive the manuals for all of the other components that go into making your trailer, too.
If all else fails, free free to ask questions. There's years and years of combined experience here and a huge number of friendly people.