Thank-you everybody for your replies. It is appreciated! So, from what I read here is the list of "things to remember"....
Electric Hot water
1) Fill fresh water tank with water (there are two connections outside on my trailer...one for direct hook-up and one goes into water tank)...
2) Turn hot water taps on inside trailer to get rid of air in lines (cold water will be coming out of hot water taps at this point)...if using water from the tank, turn pump on too.
....if I am hooked up to the water supply that goes directly into my trailer and up to the sink...does water from that connection go into the water tank too?
3) Turn on switch outside for the water heater (once the tank is filled
...I need to remember to flip the switch to "on" on the breaker panel too, right? (it is off right now)
4) Wait and enjoy hot water!
Third & fourth questions
....should I turn the switch for the element off outside on the water heater everytime I unplug from electricity or is the element 'smart' and just knows when the electricity is disconnected...I won't be damaging it by leaving it on and unplugging my trailer from electricity? I also have to remember to keep water in the hot water tank at all times if it is on otherwise I'll burn out the element, right? In all the years of owning a trailer (older Bolers), this is the first one that has a hot water tank, I spoiled myself!!
Fifth & sixth questions
...inside by the water tank heater, there are some pipes with valves on them...do I need to turn those valves? Are these the bypass valves Alf speaks of? I really should have been paying more attention when "Dave" (I think that's his name) was explaing this to me at my orientation....I was just so darn excited about picking up my trailer!
I have read the info that came with the trailer about the water tank and heater and I watched the video on this site about the new trailer too...I just couldn't figure out if I was missing something.
Gas water heater
1) basically same as above except instead of turning on the element, I flip the switch on inside the trailer, light goes on and then goes off when the flame is lit.
Thanks for all your help!