I'd highly recommend Ruben for anyone looking for a paint job. He will use any brand paint you'd like but has good pricing with Sherwin Williams so I would tell you to follow his recommendations.
As for actually using the sprayer, the main thing to remember is to not overcoat with paint. Two or three quick passes will minimize drippage as opposed to trying to get a full coat on all at once. (Which I learned the hard way. The first room I painted was so drippy droppy, we had to do some extra sanding once it dried. I felt so bad!) Only by actually using the sprayer will you get a method down. By the time I was done with the sprayer, I felt like a pro and actually had fun painting!

Homeowners who want one or more rooms finished during a single painting job can benefit from estimating the cost on the number of rooms and size of the rooms being painted. As a general rule of thumb, it will cost anywhere from $250 to $400 per room to have them painted; however, the more rooms you need painted in a single job, the less the cost per room will be in the end. For example, if you have 5 bedrooms that need painting in a single job, you will pay less per room than if you had only 1 bedroom that needed to be painted. It is therefore more cost effective to have multiple rooms painted in a single job, since you will save money in the long run.
The paint itself is another factor that will affect price, but you can calculate how much. There are different price points for paint depending on the brand of your choice, so make sure you choose one that’s one your price range. When you go to the hardware store, let the staff know what your budget is and they will help you find the right brand to suit your needs. You can also go online to look for recommendations and read reviews.