One of the hardest things with learning in 2016 is the prevalence of HUGE lights...big umbrellas, big soft boxes, big octas and so on; the issue with big lights? They put out a large swath of soft light, and they make it hard to learn exactly where to place the lights. They throw light 'everywhere'. Shoot-thru umbrellas can throw ambient spill; flush-faced softboxes can throw a lot of light off to the sides; 60-inch umbrellas are sooooo big they can barely be used indoors unless you have 13-foot high ceilings.
There's a lot to be said for 16- or 20-inch parabolic reflectors (with diffusion added to the front), or 20- to 22-inch beauty dishes, as a way to really learn the how of lighting. The 16- and 20- parabolic reflectors are "old-school"; the new-school is the beauty dish in 20- or 22-inch sizes most often. The difference is the beauty dish usually has a disc-shaped deflector, while the old-fashioned parabolic does not have the deflector, but allows the flash tube to be seen, hence the common use of a mylar front diffuser.
Basic idea: 1) Main light off to one side, but the fill light placed right by the camera, aimed straight ahead. Or, 2) Main light off to one side, fill light proivided by a reflector placed in front of the subject's nose line. Avoid two lights at 45 degrees to the subject most of the time on people.
Lighting Ratio of about 3:1: Main light at 4.0 feet, or 5.6 feet, or 8 feet, or 11 feet. Fill light unit set to the identical power with identical modifier at one distance greater than the main light distance. Mathematics and f/stops works in strange ways. The second way to get this 3:1 lighting ratio is two lights, one at Full power, other at Half power, at the same distance to the subject.
30- to 32-inch umbrellas can create beautiful light that looks a lot like a beauty dish. Ones that have black backing, and reflect the light, are preferable. Photoflex and Westcott make GOOD umbrellas. 28 x 28 Made in China soft boxes are pretty handy for head and shoulders and low-ceiling rooms. The medium 36" x 48" Photoflex white-interior softbox is a standard size useful for many situations, and has the rectangular advantage. With umbrellas, use the right spill-kill reflector on the light, or you risk letting raw light leak out everywhere, off to the sides and ceiling/floor. Again...an eggcrate grid can be super-useful on a softbox or octabox.
Studio lighting, for people or for products, is an entire field of photography. If you have no people to work on, get some kind of a stand-in. Hell, even a basketball. The biggest issue I see is all the YouTubers who use nothing but one or two kinds of light modifiers, and who really do not understand what light shaping tools are. Grids, flags, reflectors, diffusers,snoots,different types of metallic reflectors, barn doors, cookies, etc..