Take some time and go to an RV dealership in your area and just walk through as many units as you can reasonably absorb. Take a camera and a note pad and begin narrowing down what you like and don't like.
As in your choice of life-long partner, it's just as important to know what you DON'T like or DON'T want in an individual, as it is to know what you DO want. Same is true with an RV. Knowing what you DON'T want is equally as important. With no prior experience, you should just spend time looking at various campers with an absolute firm commitment of not purchasing anything. Make it a goal that you look at 50 different RV before allowing any salesman or individual begin to pressure you into buying. It will not take long (really) to realize what will work for you and what will not. You'll see some units with good qualities and others that are just ... "OMG what were they thinking!"
If you find one that tickles-your-fancy, notate it, and come back later after you've experienced the committed list of 50. At least that way, you have something to truly compare.
Some campers will speak to you immediately. Others will yell in terror! Once you identify something that speaks those wonderful words ... "Ah Ha!" then go back an look at it REAL close for things like water damage, wear and tear, faulty appliances, failing roof, bad tires, stuff like that.
I suggest a dealership because that is where you'll have the most concentration of RVs in one spot to just window shop with with minimum running around and frustration of bumping into pure junk and wasting your time running from one to the other. That does't mean if find one that suits you to jump at it right away. Playing a bit of cat-and-mouse with the previous owner is a good thing.
The first question you should ask them is, "how long have you had this camper 'for sale' for? If a long time, you know there's no rush on a decision. If they say, "2 hours" ... you might have to move a bit quicker.
Once you get a feel for the good, the bad, and the ugly, you'll have some ammunition to really begin research into that specific model.
Good luck with your search. These are my suggestion on getting started. And yes ... it does take patients and time ... but the end is REALLY worth it!