"Yes it is Marketing Manager. The type of work would be the same in ways because I drove delivering also at my old job and my new job will be delivering as well. "
This is good. You should emphasize the similarities in the two jobs to the loan officer.
"The pay will be increased quite a bit and yes it is based pay. I will get the same pay weekly every week. "
This is good too, loan underwriters like to see that the income is steady and regular.
"I can get documents and it will state that my pay is more. "
Excellent, documentation is what underwriters thrive on, especially now that lending requirements have been beefed up. Any information that does not neatly fit into one of the documents can be summed up in a cover letter that you yourself write.
"It will go up at least 150 more a week. What kind of documents will i need?"
Even though you finished your old job, the underwriter needs to see the documented prrof that you earned what you earned in your old job. W-2's, a months worth of recent paystubs, even a copy of your tax return can provide this information. Then all the paystubs from your new job. If you have a contract with the new boss, supply that. If you have a pay schedule showing the pay you get for your deliveries, that can help too.
I am not the primary signer on the loan and we are only 30 days to close, did I make the wrong move for more money? - If you believe you have good job security and better prospects at the new job then you probably made the right move. You could state that in your cover letter, too.