I'm not sure what you're trying to ask...
A: How much of the total offseason should go to OL?
or B: How many of the OL should come from FA / how many should come from the draft?
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A: at least 1 guard. at least 1 tackle, a swing preferably. After that, who knows, add as much talent / depth as possible. hard to give a %
B: I would prefer most of the OL to come from free agency, a starting caliber guard specifically. After that, its a mix and match. But I would try to shore up the OL as much as possible before the draft so we may not be "forced" into taking someone just to take them early.