kinda lost in restoring my phone from root

[ou2mame]

i've had this phone for about a year, and when i first got it i rooted it to get tethering enabled. i ended up deleting a few stock apps, and can't run a sprint update, and i just want to update the rom from last year to something more current, and i want to root it again as well. can someone please walk me through what to do, and where to get the stock rom to do it? i've looked around, but there's so many different versions and i don't know what to do considering i barely remember what i did in the first place.

my android version is 2.2, and the software version is 3.26.651.6