I feel like @Fishlegs and @TnRiver46 ought to have some good intel for you.
As far as differences from LMB, the first thing I'd say is, it is harder to find them, but easier to get them to strike. Lure choice is less important than reading water and evaluating conditions to determine where they most likely are. Smallmouth move a lot and may travel miles to find a preferred spot. In free-flowing river sections, reading water is a skill all its own, and takes some practice.
The second thing is, they compensate for smaller mouths with greater aggressiveness. So, all else equal, you tend to get more strikes, but fewer hook-ups. Sticking to baits in the 2-5" range helps a lot. I have no doubt you could catch a smallie on a 10" worm, but you're more likely to be successful on a 4-5" worm. They also tend to "slash" at topwaters (trying to stun prey? nobody really knows). So trebled baits, like poppers and walkers are often more useful than frogs and toads. Of course, smallmouth will attack them all, but will they hook up? That's the question. Buzzbaits should have a trailer hook. Spinnerbaits maybe a trailer hook, but less important, in my experience.