You would need a partnership agreement that would cover everything. I can prepare one that covers all of your needs for less than $2000.00.
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Personally, I like using LLC's for my clients that engage in real estate ventures of this type. You should place the asset in the name of the entitty with them having a priority on return of their initial capital investment in the amount of the money they put up for the property. Also, in your case, require unanimous consent as to disposition of the property. These powers and requirements will be refelected in the operating agreement. My hourly billing rate for Avvo inquirers is $250.00 per hour, plus costs.
In addition to the other things mentioned above regarding corporate structure, you must be mindful of your DRE requirements. If your commission is part of the enterprise, you should determine that you are not improperly fee-splitting with non-licensees. I suggest you call the DRE hotline. Though I am NOT a tax advisor, it is worth mentioning that, if your commission is part of the contribution to the venture, you may have tax consequences for the income which could cause you to have a different net result from your partners so please consult with a tax advisor.