I would advise against the Consolidate Credit unless you are just in a real financial mess and have racked up tons of debt that you can't pay for. You will end up paying the Consolidate Credit back more in the long run.
Get your free credit reports and see where the issues are and what can be fixed by calling the companies that you had credit issues with. It will take time and financial responsibility to build your credit back up. You can't miss payments or even be late on payments. Try not to take out any further credit if you can unless it is necessary for life.
There are plenty of places online that will show you how to build credit over time. As Yancey stated, get a report from one of the big three reporting agencies.