1) By playing often, being able to tell cheats from lag and being trustworthy.
2) houses are expensive but you can buy them by standing in the house icon and typing !buyprop
3) It comes with time but eventually you can see the difference between hacks and lag. A good indication is if you shoot them with a type of shotgon and they fall down but don't lose health. Admins can also set their health / armour to see if they are cheating.
4) No hacks are permited. Our admins should ban them if they notice it. You can report players here at the website also.
5) Minigun is not avaliable in the server at this time.
6) Yes you can hold an auction here at the forum, or have a player use the !givecash command to send you money and then sell the car to them.
7) was that on this server? o.O