Here are some basics:
Basic controls are depth and speed. You control them by jig weight, line diameter, and trailer bulk/buoyancy. Start with proper line diam for the given situation (depth, clarity, and cover, mostly). Then decide how deep and how fast or slow you need the jig to run at. This will take some experience as there are many permutations possible. Want to slow a given combination down or speed it up? Add a bulky trailer, or trim it down.
Choose a head style for the cover you are fishing: Cone-shape for weeds, bulbous (Arky) for wood, football for rock.
Choose a hook matched to your line strength. Don't go Flippin with 50# braid with a light wire hook. Don't try to stick a big bass with a heavy iron on 8# mono.
Choose a color that either mimics (imitation is impossible) prey, usually fish or crayfish. Or, just choose one you LOVE and fish it with confidence.