How exactly does a car loan work?

I bought a 2007 Toyota Camry last August. It is still appraised at $21,900 in the blue book. However, I have not so great credit so I still owe $28k on my loan from Citi. I have been thinking about trading in my car and getting a used car that is about $13k or so. Is that stupid? Any help would be appreciated. Thanks!

How does a preapproved car loan work?

I’m about to get a new car just dont know what yet. Want to get the loan today because Friday Im going to go look. Want the money with me so I can buy it on the spot.I know for a regular car loan they ask for a VIN number.If I get a preapproved loan and dont use all the money that is on the loan how would i use or return it?

How does Bankruptcy work if you are married?

Wondering how bankruptcy works if you are married. Say if one has awful credit, and the other has really good credit. The one needs to file for bankruptcy. Will the bankruptcy affect the other spouse? Or can the one do it alone without affecting the spouse at all? Any info or sites to look at would be appreciated. THANKS!

Can I get a refinanced mortgage if i start a home business with no employees and still work my regular job?

I want to refinance my mortgage and I want to start a home business before doing so. It would have no employees and I would still keep my current job. My home business will not require any due balances or credit lines to increase my debt. Would mortgage companies see the worry that I would quit my regular job or would they trust that I would maturely handle the mortgage payments? In other words, would I have no problems getting refinanced under these conditions. My credit score is about 650 and I’ve been at my current job for 1 1/2 years but have had steady employment for a long time. I have also paid my mortgage on time for 12 months.
The reason I am asking is because what I will be doing requires a vendor license. Therefore, in my ssn, it would show the business based at my home address.
I am actually looking for a new mortgage loan, not a home equity loan or personal loan and I don’t need to borrow to pay debts.

Do credit repair services work? Which is the best agency to go through?

I have paid for alllllll of my old collection accounts and I’m just waiting for them to drop off of my credit reports. I’ve been looking into credit repair service on line and wondering if they can actually help. All of the items on my reports are actually MINE and I did actually owe them, but they are all FINALLY paid off. Is there any hope to get them removed quickly?