First off welcome to the forum from Ontario and congratulations on your new rig.
Your questions would be easier to answer with pictures. Your rig is a year old so all the stickers and labels should still be afixed. These are good questions for your dealer.
1. Industry standard that sanitation plumbing is off the drivers side, answers the first two t handles, now the one on the passenger, good question unless it it the low point drain for winterizing.
2. Is the cap a screw on/off cap, then would be the fresh water tank fill, if it is a plastic "female" ended connection which would accept a garden hose then I would say it is the black tank flush.
3. Yes you need to sanitize the fresh water tank, generally accepted practise is with bleach. Take 1/4 cup in 2 gallon pail and pour into fresh water tank and fill with water. When doing this take out your cartridge for your water filter if supplied. All the plumbing lines in an Rv join together after the the filter and water pump so you are in fact sanitizing the tank and lines. Close off the water heater line in as it does not need to be done. Run all the facets, when done dump remaing water in fresh water tank and fill again with clean water and run through the system to flush the bleach.
4. TV and such while driving, not sure on thids one, I have a TT and no one gets the opportunity to watch a movie when we are on the road.
2009 F150 XLT crewcab 5.4L and 3.73
2010 Flagstaff 27 BHSS