I loaned money, got a promissory note, amount over 25k, how do I take the person to court to collect, what paperwork do I need to file, etc.?

Unless your promissory note provides that you can file a confession of judgment (it may be called something else in Texas) upon default, which is unlikely and might not be enforceable in all states, you can't just file a judgment, you have to sue the debtor and prove your case.  The paperwork for lawsuits varies in each jurisdiction, but the clerk of your local court should be able to help you with what you need to do.