(You may want to ask the moderator to move your post to the Class B section rather than Class C.)
We had a Class B van until recently and often met mature solo women travelers in Class B vans visiting faraway places around the US and Canada. While the concept is great (and the reality often is, too), there are challenges and it's not as simple (or low-cost) a travel option as it might seem.
You'll need full working knowledge of all the "house" systems to live in it - for fresh water storage, battery power & electrical systems, propane use, refrigeration, heat & cooling, disposal of gray & black water, generator maintenance, solar systems perhaps, and so on. It will help greatly if you are handy enough to deal with repairs, blown fuses, etc., and if you have an understanding of the engine, brakes, and other automotive elements. For any RV, old or new, it's not a question of "if" but "when" things will go wrong, and some repairs and parts are costly.
There are many places you can park free to spend the night, but that's not true everywhere. Some municipalities or businesses have laws or rules about sleeping in vehicles. You'll still need to find places to dump your tanks and take on fresh water and propane fairly often, since Class B tanks are small. You may decide to pull into campgrounds sometimes where you'll find those needed facilities and electrical shore power, and will need to budget for that cost.
You've come to a good place to ask questions, but you'll learn a lot by doing. If you can find a unit to rent for a week, it will help fill in the blanks.