Welcome mate, you'll never find anything better to do with your weekends!
I've got a personal distaste for the G36 platform's aesthetics but I do know they have a reputation for accuracy over comparable-value M4's/AKs, something about the inner barrel being better supported within the outer. I'd say my experience handling the weapon backs that up.
I'd like to say though that while everyone will steer you away from sniping (and for good reason - with a cheap, stock sniper you'll be at a serious disadvantage firepower-wise), if you're real passionate and have some money to burn then by all means do some research and buy a cheap sniper! You're gonna have to overhaul the internals in order to make it competitive anyway, but some of the best snipers come from dirt-cheap base guns and - if you're prepared to make some mistakes and pay for them - bolt-action springers are nice and simple and a good introduction to the innards of a weapon and installing compression mods (and solid compression is always a good thing)
Finally, take some time to learn the laws pertaining to your new time-sink. Last thing you want is Johnny Law pinching your new pride and joy!