happy birthday, and oooh, nice bit of kit you have there,... wish i had an uncle that was into photography :P
there are loads of videos on youtube about how to load/unload film so you might want to watch a few first,.. its easy as piss so dont worry.
basically, there are 2 types of film that most people shoot,... c41 colour negative and e6 reversal/slide film.
c41 is very forgiving, and you dont need your metering to be spot on to get a decent image. also most places can still process it for you in under an hour. some places will even do a CD for you. low res scans but still nice to see your stuff without having to have prints done.
e6 is slide film,.. a bit pricier and development times depend on where you are,.. in the a big city you might get same day processing, in the countryside you might need to wait a few days as they send it out. e6 is less forgiving, you want to make sure that your metering is decent.
having said that,.. c41 under exposed turns out muddy,... you know that 'vintage' hazy crappy film look? thats under exposed c41. e6 under exposed is moody and dark with inky blacks. c41 over exposed can be powdery and pastelly, while e6 will just go all white.
c41 you can over expose more without losing too much of the scene, while e6 you can underexpose more and it wont go muddy hazy brown,... it'll just be black.
i would suggest you play with c41 first,.. kodak gold is pretty cheap and i think can still be found almost anywhere. if you're after a 400 speed film fuji's superia range is a good choice.
i'm sure a few will recommend you shoot black and white, but again, depending on where you are, it can take a while to process, which kinda takes the fun out of it. there is a kodak c41 black and white,...kodak BW400CN,.. is alright, but cant replace the loverly tri-x.
after choosing your film, you load it and tell the camera what iso film you're using,.. and then you go shoot. maybe try a few in full auto, then aperture priority, then shutter priority and see which suits your shooting style best. if you know your exposure you could just go full manual.
benefits of film? imagine if you could swap out your sensor,... its like that,.. every film has its own character and you can pick and choose depending on what you're shooting.
there's alot to learn and flickr groups are very helpful, as well as youtube channels,... but thing to do tho is to just go out and shoot as you need to learn the camera, and more importantly the film that you're shooting. try and stick with one kind of film till you get to know how it performs, then switch it up later.
if you like your colour, wait till you shoot e6, you wont want to shoot anything else,... cept maybe medium format e6 :P
have fun!