Crohn's is completely different for everyone. Some people have bleeding, some don't. Some people have terrible diarrhea, some don't. Soome people have devastating weight loss.
Some people's symptoms may stay on the mild side with minimal medications, Some people may flare up and feel like they are never going to come out of it.
I was on a mild drug, sulfasalazine, for quite a number of years before it quit working and I needed something stronger. Hopefully the pentasa will work for you for a really long time.
I think one of the most common surgeries for Crohn's is a resection. That's where they take a section of the diseased bowel out and piece it back together. Also - sometimes people need surgery for a stricture. That's where the scarred tissue gets so small that food will not pass through it enough, so they cut that portion out. I have only had outpatient surgery for a fistula, which is a tunnel going from one location to another.
You may never need surgery, it's not something that will be needed for sure. You never can tell what Crohn's is going to do.
I've been absolutely horrible, symptom-wise, and I've been really reeeeally great too! It's not all bad, hopefully.
As far as eating, we're all different in that respect too. Different foods affect different people. You might want to go mild at first, and see if anything helps you feel better. A lot of us try to stay away from roughage, some avoid dairy, some avoid sugar. Some are doing a SCD diet, some do a low residue diet. A lot of this is trial and error.