Hi Brandon,
Nice piece and project!
I assume you know the proper technique for using a planer sled to remove the warp. Hopefully the wood is not to warped and still thick enough by the end.
Maybe run a 1/8” router down the cut edge to round it off a bit.
For wax oil I prefer Rubio Monocoat with multiple coats or second place Osmo.
Are you sure you want one straight edge? Are you putting it against the wall?
Are you going to strip off the bark, as it will break off over time? I would also dig out the two bark pockets and sand off those edges. They would look cool with a colored epoxy accent in my opinion. A mica powder or trans tint dye.
Depending on the thickness of the end slab it will want to shift (twist) over time. Be sure to stabilize the table slab with a good base to prevent this.
When sanding be very patient. Make sure you have completely resurfaced with each grit of sand paper before moving on to the next grit.
Epoxy is fun but a bit tricky. Be sure to mix it thoroughly for at least 3 minutes for a small amount. If you have a fair amount of experience with it, consider turning it into a river table. (You know, where you cut it up the middle and invert both sides to cut area on the outside and live edge facing inside, put it in a form and then you fill the middle with epoxy.) This is only if you have a lot of experience with epoxy. Also with the epoxy, be sure the crack or hole doesn’t go all the way through to the bottom of the table. If it does use Tyvek tape or something like it to keep the epoxy from running through.
Good luck!
I’ll be camping this weekend, but will be back on Monday if you have any questions. I love working with slabs. If you would like me to come by to discuss, I would be happy to do that.