score:4
As @Bernhard DΓΆbler has already pointed out this a regular RMV connection. Weekly ticket is 41 Euro, monthly is 140 Euro and yearly is 1377 Euro.
Try https://www.rmv.de/c/en/homepage and poke in your details.
From Frankfurt Main Station take the S3 (S-Bahn, local train). It goes every 30 minutes and takes about 20 minutes to Schwalbach Nord.
If you want to live in Frankfurt, picking something close to an S3 station can save a you lot of commuting time .