Scarface when i was 16 my dad bought me a 2005 e46 325i with 18k miles ( he was driving a honda accord lol ) I was so happy that i would lean against my car with friends after school and smoke for 2 hours so that anybody leaving cud see my car lol thats just how you think when your at that age.
But I had respect for him and my car. Never crashed it and no major issues as well. Car got 100k miles on it now and guess what its my dads car now since i got a good job in summer and bought a 335i a few months ago
btw Im 21 now.
Now my advice is treat your car well and dont fuck it up and dont let your dad regret buying it in any way
As far as the mods dont worry this forum is full of info on that!