Welcome to the Jayco forums.
All CG's have different electrical box layouts and amp service combinations, so I carry a 30amp female to 50amp male adapter like this one just in case: http://www.campingworld.com/shopping...h-handle/48858
For TT tank usage at a full hookup CG, keep your black tank valve closed during use (use plenty of water) until it's full, then empty. Prior to leaving a full hookup CG I will empty the black tank and use my high pressure black rinse feature to clean the tank, close the valve, and then I will pour in a bucket of sudsy dish soap water (via the toilet) that will slosh around until the next camping trip. If you don't have a black tank rinser, just fill the tank with some water (via the toilet flush) and empty. Having a clear plastic connection will help to see that the tank is clear of solids: http://www.google.com/products/catal...d=0CF4Q8wIwAQ#
The grey tank valve(s) can be left open when at a full hookup CG, but I like to keep them closed until they are full. I always empty the black tank first (then close the valve), then the grey tanks (dirty tanks first).
Not sure what "lines" you are referring to, but your manual tells you how to sanitize your fresh water tank and water lines with bleach (I do every spring and fall).
Hope this helps.