Your 750 is 4 years old tech. It would still be able to mine a cryptonote coin but it's not very efficient - it gets obliterated by a single Vega 56. It would be akin to trying to offer Uber services with a Chevy Nova.
Don't bother with Monero. You might be able to do ETN. It probably won't break even with electricity on Ethash.
As others have said, you should do more research - there are tons of old threads detailing what a 750 used to do.
agree here. the best and easiest way for you now - run miner for electroneum
how - take a look for this thread here, it is very detailed described for newbies
https://bitcointalk.org/index.php?topic=2126975.0it is very straight forward there so you should not have a problem there to setup!