Decide whether to buy loose sheets of paper or a pad. Loose sheets are generally cheaper than pads. Pads come in a variety of sizes, which makes them more convenient to use and store.
Read the cover of the watercolor pad to find out the type of surface and the weight of the paper. If purchasing loose sheets, the surface and weight will be labeled on the art store's shelf or drawer.
Select a paper surface that's right for your ability level and your project. "Cold press" has a medium texture and is recommended for beginners.
Select a paper weight - 140 lbs. is a good weight for most projects.
Try a variety of papers to find out which you like best.