Some quick credit fixes

I would start by pulling all 3 of your credit reports. If you go to a mortgage broker they will usually counsel you a bit. Don't be suprised if a lot of the things you filed BK on are still on your report. Start now because it will take time to dispute these items and have them removed. A good way to get your score hiked up is to have a friend or relative add you as an "authorized user" on their oldest credit card. ***BE CAREFULL WITH THIS THOUGH!!! Make sure they have not been late in the past 5 years or better and make sure they dont owe more than 50% of their credit limit. If they mess up it will affect your credit! My mom did this for me right out of BK and my score raised 50 points (she added me to 2 cards). Even if you dont use the cards or ever even see the cards this will help tremendously!!! Mortgage lenders look at scores, scores, and scores!
This is a start. One other way to increase your score is to go to a local credit union and ask if they offer "secured loans". My credit union does. I put $500 to secure a $500 loan. I gave them my money and they gave me a loan for my $500. All the money you pay monthly goes into a cd that gains 2% and I only pay 4% interest on my loan. Much better rate than one of those high risk credit cards and this loan has a much better impact on credit than those credit cards!

I did not know secured cards report to credit agencies. Good info to know!

What does this do to the "authorized user's" credit score? Is it impacted in anyway?

It does not hurt their credit score, you can gain their history on their card usually immediately. It can give you a pretty big score boost if you do not have any reporting credit or need some extra points. Lenders will not usually count this as a tradeline since you are not really responsible for the loan. If the other person is late though it counts against you as well.

If your added to their card does it count on your debt to income ratio?