Printing comes out at about £12 / 1,000 for us, and delivery £30 / 1,000 (delivered with 1 other), so think about delivery - who you'd use & how much, & what areas, whether solo or in bundles - printing is secondary.
5,000 per week is good, but you don't need to jump straight to that level - that should bring about 15 jobs / wk - all of which need pricing up then doing.