The decision about when to have surgery is a very personal one, there are no right or wrong answers but many believe that delaying surgery for as long as possible is the better way to go, as surgery can have lasting effects. Once you loose part of your bowel, its gone forever.
Humira is one if the medications that can take a while to work, so you may need to stick with it a little longer, you could also have the dose upped if your doctor thinks its needed.
There are lots of other medications which you could try either alongside or instead of the Humira, including azathiopine, 6MP, Remicade and pentasa etc ( although pentasa and the others in that group would be better alongside another medication.)
If you have scarring, then medication wont treat it, but if there's inflammation, it has a good chance. Its just a case of finding the correct combination for you. Take your time and think about it, don't go rushing into anything yet.
The type of surgery you would need would depend on the location of the damage, the severity of your disease and the surgeons personal preference.