Can't get through G.O.L.E.M., tips?

I'm a NecroRanger, have a 14-26 bow, the required points (11) of marksmanship, all my armor is 60 and they all have runes. Yeah, that's a problem. You're not understanding fundamental game principles here. You don't pick two professions. You pick a primary and a secondary. You are a necromancer. You cast spells. For this purpose you should have a wand and focus or a staff. Bows are for rangers, which you are not. The point of secondary professions is to be able to round out your build with one or two specific abilities. Trying to mesh two entirely different concepts (bow + spells) doesn't work. You end up watering down your attributes too much and will never be effective at archery anyway. Remember that rangers get expertise which lowers their skill costs. As a result, their skills are usually balanced with this in mind (thus, you're paying more than a ranger should).

PS: How many campaigns have you completed? EotN is end game content. It was designed with the assumption that you've completed at least one of the campaigns. For a first time player, I'd generally recommend going through all of them first. They teach the game concepts a lot better, have a slower difficulty curve, give you access to a lot more skills, give you a chance to obtain a better equipment selection, etc. Your bow isn't even max damage. Someone in EotN should be able to obtain max equipment very easily.