The only colors I really ever use:
Watermelon/red flk or a similar variation (WM salsa, WM grape, WM candy)
Bama craw (rage tail craws)
Black/Blue flk
Junebug
Pumpkin
Just match the hatch and vary for water clarity. Don't get too caught up in colors. 8-) I don't carry a bag of every one of those colors for every bait that I get.
As far as baits go. I carry a few different types of stick baits depending if I'm weightless rigging or wacky rigging or TX rigging(Senkos if money is in your veins, tiki sticks, bps sticks, trick sticks). A curl tail worm is good for C-rigging this time of year (rage tail anaconda or powerworm). Straight tail worms are good for weightless, shaky head, or dropshot; I use a million different types depending on exactly what technique but I use trick worms, trixie flirts, gambler giggy sticks, yamamoto finesse worms. Gotta have some craws: either Rage craws or Paca craws. Don't forget rage lizards or zoom lizards. Also some brush hogs or other creature baits (Rage space monkey, anyone?).
I guess looking back on that paragraph, plastic selection ISNT so simple. Try 1 of everything and determine what you like and what works for you. I have so many soft baits I don't know if I'll ever reopen half of them (if I ever opened them in the first place! ;D).
If I was going to pick 3 soft plastics to suggest to you: Absolutely a senko or a knockoff, a zoom lizard, and a rage craw. Fish them and rig them every way possible until you feel comfortable catching them every way then move on to something else. I still learn new ways to fish old baits! 8-)