Lady Emerald Devon
You can quit as many as you like.
If you don't have enough money to pay Shady, you can use money from your agency, sell things or just be EXTREMLY careful until you have enough money.
As you gain more experience, harder cases will open.
Ridic. Hard is 20 000 ? while you can't open AIs until 100 000 exp. points.
The list is on the Newbie boards somewhere.
If you retire your detective and you are subbed, the account will be transfered. You will need to remember your detective name and talk to Sleuth Admin 'cause I don't really know what happens.
Feel free to PM anytime.