Welcome. I remember being amazed at how quickly the distances came. Even though I rarely ride more than 25 miles regularly, I easily ride 50 miles for an event. I do tend to overheat easily, if this proves a problem for you just take extra breaks. I also carry a bottle that's water only to use for over the head cooling.
A word to the wise about food/ water balance. I have difficulty balancing the two. Remember to drink often and eat early. Too much liquid can slow your gut and digestion of much needed fuel.
Where on the Gulf Coast? I live in central MS. Know there are women in Mobile area you may be able to hook up with.