All good points. I appreciate it.
Drilling through it, to hold them together, I decided to forgo. It will be too hard to do with my limited skills and tools. I will only glue them together. Maybe I will use a metal brace on the sides which will require minimal work and skill.
I will try to find a nice shop that will plane it for me. If I can't find any - I will just use a belt or orbital hand sander (I can't afford buying both) to sand it down. I thought about maybe sanding the pieces after I glue them together which will make it easier for me to level.. What do you think?
Once I get it sanded, either by using a planer or sanding it myself, I will stain it and poly it? that is it?
In order to glue them together the edges need to be jointed or planed true, flat and square, other wise only portions of the wood will be mated together and that's not sufficient for a strong and stable glue joint.
So, you are back to square one.
The order of operations for this project for me would be:
Joint one of the edges and flatten one surface on the jointer, rip the opposite edges of the boards parallel on a table saw, rejoint the edges if necessary, and then glue the boards together referencing off the previous flat surface. After the glue is dry and strong I would run the assembled top through a wide belt sander to surface the remaining unfinished surface, flip the top several times as it goes through the sander.
This isn't a big deal for a properly equipped shop, but it's not possible without considerable skilled hand work with a hand plane.
Winning the "look what I found wood lotto" is only the beginning of the story.
On the other hand if you want a truly rustic look, you can screw 1 x 3" straps across the bottom of the boards at right angles to hold them together and then just sand off the lumps and bumps on the top and call it good. There will be gaps between the boards for sure, but that's the rustic part. Maybe no sanding,
because you will change the color/patina of the wood and it may look blotchy. Those are the extremes as I see it......may someone else has an alternative approach.