newbie questions on black water tank and campgrounds

We bought our first RV last summer, with no experience w/ RVs at all.
I agree w/ the other person to go ahead and get the full hookup this first trip. It will much less stressful for you to dump and figure out your system without a line of RVs behind you at the dump station. (and usually there's a line at the dump station if you're leaving on Sunday)
We didn't do that, but it's a very good idea!