First, let me say that I am terribly sorry to hear that you are in this situation. Concerning commission, you are entitled to any comission earned, to be paid on the day that you left as long as you gave your employer at least 72 hours notice that you were leaving. You state that "there is no clause in the employment contract or commission agreement stating I need to be employed to receive commissions." While this is true, there must be something in the contract which defines the moment in which your commission would become due. If you satisfied that requirement, then your commision would be owed to you. If you did not, then it would not be.
As to what the penalty would be, as soon as the amount of your commision becomes calculable to the employer, then the employer owes you a waiting time penalty for every day after that day up and until a maximum of 30 days. As to how the waiting time calculation is determined, they take your average earnings per day and multiply that by how many days your employer does not pay you up to a maximum of 30. If you do not know what that is, then they take your average monthly salary, multiply that by 12 months, divide that by 52 weeks, then divide that again by 5 days to determine the average amount you would make per day to determine your daily rate.
As for the base amount they use, they use all forms of income. So, even if they already paid part of what they owe, the calculation is still based on any fixed salary or commission you would have been owed to determined your daily rate. If for any reason this is unclear, please tell me and I will provide examples to better help with your understanding. Additionally, here is a website from the DLSE which provides examples that you may find helpful:
Concerning your expenses, while you are entitled to your expenses, as mentioned by the previous expert, there is no additional penalty for not paying these as they are not considered to be wages.
Please do not hesitate to let me know if you have any questions or concerns regarding the above and I will be more than happy to assist you further.
If you do not require any further assistance, I would be most grateful if you would remember to provide my service a positive rating, as this is the only way I will receive credit for assisting you.