Shopping foe New Class C 30 - 33 ft

I would suggest buying used first, especially since you're new to RVing. Often times there are myriad little things that you just don't know to look for or avoid or seek out until you've done some RV camping on your own (and it's not always possible for us to list them, as the specifics can vary from person to person). If you buy new, trading to something else is likely to be a lot more costly due to the rather steep depreciation.

Renting a motorhome for a weekend or week would not be a bad idea, either, for getting your feet wet.