full tank how much?

Finally.. got my black preve already

Guys, needs your advice on the followings:

(i) Since the car so big, i'm having difficulties to do bay parking . Can any forumers give a tip/method on this beside installing reverse camera? Btw, i'm staying at apartment so bay park is the only choice
(ii) I notice the pick up was very slow when i stop at a T junction before taking any cornering. Anybody experience this? Quite dangerous also i would say since i'm still new to driving
(iii) When unlock the alarm to open the car, i straight away went to the back seat to do something and didn't start the engine and closed the door. After some time, the alarm will start beeping. How to overcome this?

tks