A: CAM charges are for common area maintenance. For example, in an office building, CAM charges are for maintaining the lobby, elevators, corridors, and outside areas (such as the parking lot). If you are looking at renting a space, the landlord should be able to provide you with CAM numbers for that space for the past several years, so you know what to expect.
A: No, it's not. California has a very strict law against non-competes, and views those as illegal restraints on trade. Pretty much the only scenario in which a non-compete will be enforceable in California is in connection with the sale of a business.
A: You will need to know what the equity split will be, and if it is 50/50, how will you manage tie votes. How will profits and losses be allocated? How will the LLC be managed? What happens if one of you wants to sell to a third party or leave the LLC?