Anyone know what size hooks or jig heads to use for these swimbaits I'm kind of new to this type of fishing and can't seem to find the right size. These are 6 inch baits and sort of thick

A 5/0  swimbait jighead should do it, while for a belly weighted hook a 6/0 would be your best bet since it looks thick. Good luck and welcome to the forums!

I use the VMC heavy duty swimbait hook in 7/0 with 3/8oz weighted keel. I use it with the 5.5" and 6.5" Shadalicious which look similar in dimensions to your lures. Cost is $6-7 per 4 hooks

I have some of those baits.   I've gotten many more hits on them than landed fish, that is some pretty thick soft plastic.  My most recent attempt to get a better hooking & landing percentage involved using an appropriate sized weighted swim bait hook and with my box knife slicing a groove in the belly of the bait, so that the hook was skin hooked on th back of the bait and totally unimpeded by all of the belly plastic.  It made the bait a little fragile, only lasted for a few fish, then it wouldn't run right at all.  It occurred to me that if I had one of those worm welding tools I could repair the damage, but I haven't purchased on of those yet.

The fragility of the bait affected the casting, so I resorted to using MH spinning gear and 20 lb braid instead of bait casting gear and even then you kinda had to lob it rather than sling it.  The baits do work in the right situations, but for me, landing the hits has so far become problematic.   Good Luck.