Go take the riding course!
In Minnesota you go take your written tests, get your permit, and then passing the riding course gets you your endorsement. Not sure if that is the same for Texas.
Regardless of the steps, the riding course is the best place to start. The instructors are a wealth of information and will get you started on the right foot.
Majer had some very good advice, and beyond that I would suggest you put all prejudices aside and start small! Work your way up in size, riding conditions and distance. Grow in bike size until you reach your ultimate.
It is a slow progression, but you will get there and eventually you will do things like ...

or this three days later ...

And before you know it you will just go for this ...

Photo credit to our future VP, big Tommy T!
Note full leathers, except gloves, helmet and bug eyes! I was fighting a 35 mph cross wind that day on the way to wedding rehearsal and didn't want to take any chances ... and I still took the time to visit a shrinking friend in that weird land to the south
Note to M'ette - That bike now also has a trailer sized and picked because it will hold rifle cases. It has been to Kansas already, and those "buttless chaps" are coming to your neighborhood next year at Pro Am time ... again! 