Since you have an Old House. You will need methods that are Meant to be complementary to an old house without compromising it's construction (ie: trying to retro in new materials that don't play well with the old materials)
Order up a couple of back issues of "Edifice: Old Home Magazine
Issue #19 regarding proper roof/attic insulation and soffit venting. It will blow you away how warm an old house can be "Without" blown in insulation.
Also get a copy of Issue #7 regarding all the ways of using caulking in balance with the house construction to make an old house non-draughty and warm. No need to start filling the walls with insulation at all, and if you did...you will more than likely get a serious rot issue very fast.
These old house are NOT modern houses...and should be treated as such.
Good information that you're not going to find at Home Dep*t