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@carson
cranks are more likely to be loose than the BB broken tbh.
can i suggest as follows:
1) determine what crank / BB coupling you have (e.g. splined; square taper; external cups)
2) establish what tools needed to remove cranks
3) remove cranks and inspect BB. if the BB is moving around as it shouldn't then you are probably right, it's fucked, unless it's an old style loose bearing one in which case could be serviceable. if problem is flappy cranks unlikely to be BB issues imo
4) if BB is fucked establish what tools you need to extract and replace...
5) if BB ok then replace cranks nice and tight - for flappy cranks check that they are not damaged, particularly if using square taper BB
sheldon brown is your friend. also, bikemanforyou on youtube has helpful videos, particularly for servicing older bike parts. he's a bit, well, you probably wont want to like him but he knows his shit.