Kerlan,
Yes, you only get one standard action in the surprise round. However, you have the initiative, so the party's actions in the first full round will immediately follow this.
Centering the Web spell as you have indicated will ensnare the three southernmost hobgoblins thoroughly. The one in K26 is not between two anchor points for the spell, so he will only be "trapped" in the webs for one round until he can extricate himself. (Actually, he is in bed and was asleep until the Web hit his face and woke him up.) The webs to the north and west of him have no support, so he will be able to tear himself out. the other three are, um, screwed, and the door at that end of the room, which is closed, is blocked off by the webs.