I'm looking to buy my first hand plane. I've never owned or even used one before.

My first task will be to flatten a 27" by 48" 2x4 pine work bench top.

My second task will probably be to plane the end grain on hardwood boards that make up a new exterior porch screen door. I could also see needing to plane the edges of this door to fine tune its fit in the opening.

Can I do all three of those tasks with one plane or am I looking at three different planes?

Either way, I am a fan of buying used tools on Facebook marketplace but of course I have no idea what I am looking at. I dont know what planes are worth, what's junk, what's a jem in the rough, how to tune them up, etc. I also don't currently have the set up to sharpen a plane blade.

Any advice people want to provide would be greatly appreciated.