24/7, keep with it if breastfeeding is what you really want to do. You'll both get the hang of it soon. It can be frustrating for a baby to go from bottle to breast since a baby has to work for milk from a breast and not from a bottle.
Seriously though, go pick up some fenugreek and take 1-2 tablets 2-3 times a day and pump and nurse like crazy. In about a week, you should start to see a supply. As you gain a supply, give the breastmilk first, then supplement with formula, slowly decreasing the formula as your supply increases.
Good luck!!