Have you not owned a car before mate?!
Seriously, it'll be fine. Park it outside, inside, next to a wall, under a bridge, near some pikeys, it'll make no difference. Okay, so don't park next to the pikeys. I'd be more concerned about damage from other users than anything else, so sticking it next to a wall (any wall) is better than having two cars park either side, possibly opening their doors into yours.
You don't need a cover, unless you intend to properly wash it after you've parked up. All you'll do it capture the dirt and dust on the car and the cover will scratch it into the paintwork.