Seems bus 6 is the best one to take from where you will be - here's the map:
https://maps.app.goo.gl/WXGPDFBWCwGdUX2cA
The tram sort of goes in that direction, but it makes you walk more - to get to the stop and then from the stops.
Most buses now have the "tap" machine, so you can also buy your ticket with a credit card, or apple pay/wallet set up on your phone.
Here's the article on moving around with buses and trams in Florence -
https://www.visitflorence.com/moving-around-florence/by-bus.html - I'm actually rereading it all and doing some edits, but for the most part, the info is up to date. I'm trying to include more info on the trams, considering the system is growing and it is easy to use, if it runs along the route you need to take.