The typical installation would use a 2x6 all the way around the room at the height you want. Cut and remove the existing drywall so the 2x6 will be fastened directly to the studs.(not through the drywall) This will be the opportune time to locate the wiring that you need to tap into. And don't skimp on the nails as all of the weight of the framing, drywall, and stored items will be on these nails. Then every 16", put a 2x6 ceiling joist fastened with joist hangers and joist hanger nails. Don't forget to take into consideration that you cant have a light where a joist is, so plan accordingly. You may want to spread 2 of the joists out a bit, to leave access to the space. 23" in-between in typical, but if you are going to use the pull down stair type access, then check the rough opening dimension. Dependent on the weight of the items that are going to be stored up there, you may want to use 5/8" or thicker plywood for a floor. Be sure to orient the grain of the plywood across the joists. As far as canister lighting, choose lighting that is rated for use in enclosed areas. They usually say "IC rated" on the box. The IC stands for insulation contact. They cost a little more, but safety is paramount. As far as a finish, if you don't have the confidence in yourself to mud drywall(a ceiling is not a good place to teach yourself), and don't want to pay for a professional, then tongue and groove "V-groove" is a pretty fool-proof choice. It is very forgiving, and can be stained or painted, and really looks good. It is one of my favorite finishes. Hope this helps.
lowering a ceiling
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