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I recommend read up on some bodybuilding forums.
There's thousands of questions about diet. And even more answers. Just read and pick what you think would work for you. Try it for a few weeks, then modify it accordingly.
Yeah 10 lbs in 3.5 wks is a bit much. As with anything else, you want to do it gradually gaining around 1-1.25lbs a week. If it's More than that, you're just putting on extra fat, which you're going to have to work that much harder to melt off when you start cutting.
Download the RunKeeper app. It has a detailed laid out plan if you want to run a marathon.
I'm doing a 1/2 marathon in a couple months, but when I get serious and try to do a full, that's gonna b my go to app.