I recently recieved two bubble bags from a friend, a 120 and a 73 is there a way I could make good hash using just those bags or will I need to buy more for that?

You will definitely need more bags to make quality hash.

I wouldn't try with those, you would be missing alot of the good stuff and you need a workbag. Get a 220 & a 20 or 25 and you have a complete set. You could try turning the bags inside out over a bucket and try dry sieving the trichs through.

Honestly get the 220 micro bag as well. The BEST hash comes from the 70 micron level, so you could get away with having the 220(to remove the big stuff you don't want in your hashish, the 120 to catch some decent hashish, and the 70 will catch most of the goodies from your trim (best hash from this screen), but I'd invest in atleast a 25 to catch most of the gland heads that get through the 70 screen. Why waste good hash?