My suggestion is this. First, make sure that you make all of your payments on time for at least 6 months. Meanwhile, try to save as much as possible to put as a down payment on a land contract.
Most land contracts only require a small down payment ($1,000 +/-) but if you can put down more then you show the owner that you are serious. Probably your biggest challenge, however, will be in locating a seller who will accept a land contract. Start by asking owners of homes that are available for rent. Another option which is similar to a land contract is a rent to own... but that is another discussion.