Start small - like 6 - 8 feet small and you will start to figure some things out on your own. A few other tips - Water speeds up as it approaches the lip which you need to anticipate or you will find yourself in the backseat.
You don't want to end up in the backseat.
Everything will seem VERY fast until you become really comfortable running that size of drop. Once you can land and control your landing add about 5 feet. But remember a 10ft waterfall can break you back!
It's pretty hard to speak in general terms as every drop is different but 'generally'
Lean forward to protect your back
Keep paddle away from face so you don't eat it by mistake on the landing
Keep your arms tucked in (not raised over your head)
If you are landing to flat and don't want to try to land on an edge
Don't go too big too soon.
Work on that on the under 10 footers, run as many of them as you can with folks that are more experienced and you will start to figure it out.