This company works with Composite Fiber Material and has a branch in Texas. I've had a number of successful projects with them. Check out www.structural.net. Good Luck.
You need to know the design of your footing(s) and also to calculate the loads that will be transferred from the roof and storage area above to your new beam. Once you know these loads, you can design the beam. once you know the design of the existing footing and the soil bearing capacity...
