The only trick that will get ya with the Rolleiflex is loading the film. You need to make sure the film is fed
UNDER the first bar. If you feed it over the bar (as is the case on many other TLR's you will simply wind the roll through the camera the the counter will never engage and lock properly ultimately spooling the whole roll onto the take up spool. There is a decent video on how to
load a Rollei here and lots of others out there on how to use one. If the camera does not have an empty spool in it you will also need a blank take up spool. If there is a camera shop near you they should be able to give you one. If you live in the states, feel free to PM me your address and I'll drop one in the mail for you.
At minimum you will need a way to meter light, there are some apps out there for this as well as lots of hand held meter options. There may even be a meter sitting around near where you found the camera.
If you are looking for a decent film to start with in the BW department I like
Ilford HP5 400 speed or the
100 Delta if you prefer something a bit slower. The 100 and 400 stuff out there from Kodak is also bullet proof. I do home processing with all ilford chemistry so I prefer their film. If you are looking to get into color
Kodak Ektar is a nice 100 speed stock to work with.
The best advice I can offer here is to pick one film stock and shoot at least a dozen rolls of it before considering changing. A lot of people like to sample film when they get started but until you get your metering technique down, understand when to use what film and really grasp how to visualize the final print you should keep as much constant as possible (including film and chemistry). As for processing ask around on here for a local lab (there are more left than you would think) or you can use a mail away service.
If you get a few rolls in and find that you like it, that its something you may want to keep doing and BW is your jam, consider developing and scanning at home. Second hand stuff can be had really cheap these days (free if you know where to look) and its really not that hard to process.
Anyway, Rollei's are awesome, you will love it, have fun!