I have a 96 F150 and I need to replace my clutch. My tranny code is M which should be the M5OD-R2 (correct?) I'm not sure if my clutch plate is a 10in or an 11 in.

You will take old parts in so no need to know ahead of time what size.
Basically clutch sandwiched between engine and transmission.
Transmission usually easiest to remove.
Drive shaft first.
If starter on tranny, then remove batter cable.
Sometimes ground strap.
Speedo cable, backup lights cable, etc.
Small bolts on bottom plate.
Support transmission and engine separately.
Some trucks have removable tunnel cover, which makes it much easier.
6 large bolts between engine and bellhouseing.
Lower transmission and back of engine only enough so you can slde transmission back.
Then slide it back out of engine and clutch.
Usually about 6 inches or less.
Then get it out of the way.
About 10 bolts on pressure plate.
Do diagonally and in steps.
Friction disk sandwiched between pressure plate and flywheel, will just fall out.
Throw out bearing is on fork back in bellhousing of tranny.

Check pilot busing in center of flywheel.
Supports tranny shaft, so must be good, well greased, no rust, no binding.

Install is reverse of procedure, except you need to hold the friction disk in center, while tightening pressure plate. They sell a cheap plastice stub shaft substitute that you can buy or improvise. But important, because you will be trying to get that heavy transmission with long imput shaft back through the fiction disk hub and into pilot busing. Alignment is critical. Sometimes turing engine helps.
Extra long bolts temporarity, also helps. A little rocking and shoving. Constantly compare gap on bottom and top of bellhousing to engine.
When it slides in, youwll know, and an bolt it back up. But don't try to just force it.
Also don't over tighern pressure plate bolts, because they are small. Use torque wrench.