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You are going to have to seek to file for divorce, but in Texas you must be residing there 6 months before you can do so if you want to file there and not in Oklahoma where you previously resided. You can also go to the Texas child support
enforcement section and ask for help collecting child support, but you will have to give them a way to find him to serve him and if he goes to Canada it may be that they will not be able to collect from him if he has no income at all. You can contact child support enforcement at the Attorney General's Office. See: Child Support Enforcement
As far as getting a divorce filed, because he is not in the state and you would likely have difficulty serving him, you must use an attorney and they will have to first try to locate him and then ask the court for an order to serve him by mail and/or publication in the paper so your divorce and custody action can continue against him. If you cannot afford an attorney go to legal aid and also call the Texas bar and ask them for the pro bono attorneys in your area who can assist you with this.
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This is NOT the practice of law nor is it legal advice to you, it is merely educational information for you to use to seek out a licensed attorney in your state to get actual legal advice from them. Please use sites such as http://www.martindale.com or http://www.lexmundi.com or http://www.hg.org to find a local attorney to get actual legal advice in all matters.