Can you help this first time home buyer?

I am trying to get ready to buy my first home. I received three credit ratings (scores). These scores range from 705-711. What can I do to raise this or is this score okay as is? I will be paying my car off 1.5 years early. Will this bump up my credit score? How much money should I save prior to buying my first home? When looking at homes, how can I tell if the home is going to be a good investment?

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