New to lifting - need some help!

Hi! I just joined
So I have a 2018 TRD Off-Road. Mostly stock except for some KO2s and the Pro wheels. I've owned a lifted truck before but never actually bought the parts/done the research.

I'm a geotechnical field geologist, I'm in 4H/4L daily and can drive through some pretty nasty sites. Lately I've been bashing my skid plate more often now that we're getting into winter it's starting to really worry me.

I want to do a 2.5" - 3" lift and I think I've set my sight on King. The parts are easy enough to buy, but what else do I need for a lift like this? UCAs? Leafs? Hydraulic bump-stops?

I have no idea what adding leafs are actually for, and I'm hoping for some brand recommendations along the way if I need them and UCAs.

Also, the on-road body roll on the stock suspension can make me a bit nauseous, will the Kings help with it?