Contracts

I am owed $1,000.00 from a company I used to do work for and had agreed to sell product for after I left. I was to be paid 5% commission for parts sold. I sold these parts to a company I do consulting work for. My old company is now bankrupt but, the company I sold these parts to owes them for parts they received from my old company. What type of documents do I need to give to the company that received the parts so they can withhold the $1,000.00 that is owed me before they pay the old company for the parts? The company is willing to do this for me as long as they are not going to have a legal problem with the bankrupt company.

The past Saturday, we were at a car dealer to test drive and try to buy a new minivan. They don't have the one we want in stock, the sales person said they can find one for us. He told us to make a deposit $1000 to lock the price we agree to. My question is I don't want to buy the minivan anymore; can I get my deposit back from them?

A person has asked me to keep an eye out for a (high end) residential property on Nantucket. In early stages (my viewing of a property) he wishes to remain anonymous. Can I collect a finder's fee from the listing RE agent in the event of a sale? (form to be filled out before my viewing)

I need a general consulting form for use. I consult in the insurance brokerage industry on a variety of management metrics, strategic direction, growth an mergers.

Can I get my lot deposit back if the developer's agreement says non-refundable?