My wife of 23 years just walked out a few days ago leaving me here with my 12 year old son, no money, no phone, and no vehicle. Now she wants to come back in to take out her belongings including everything under the sun. I told her NO! Do I have the legal right to keep her out of the home in the State of Ohio? There has been no legal paperwork filed yet that I am aware of. Any help would be greatly appreciated.
Nope. It's her house as well as yours. She can come in whenever she wants and she can even move back in if she wants.
If there's to be a divorce, then one of you should file to get the ball rolling. That also gives you both protection. For example, if no divorce has been filed, she can spend as much money as she wishes. Once the divorce is filed, she can not dissipate assets - and is basically limited to using marital funds for living expenses and legal expenses. Once the divorce is filed, she can not dispose of any other marital property, either. She would be allowed to take her personal belongings with her, but probably not things like expensive artwork, etc. Also, once divorce is filed, your attorney can petition the court for temporary support while you're looking for a job.
Meanwhile, you need to get a job to support yourself. While you may get spousal support after 23 years, it's not going to cover all your living expenses. If she walked out on a 12 year old kid, that strengthens your position for custody, too. If you end up with primary physical custody, you are likely to receive child support, as well, but that's not going to pay the full cost of supporting a kid.
Bottom line, get a job and see an attorney. Your attorney will be able to work out a fee schedule - either being paid from marital assets or asking the court to have her pay.