I think you are going to have fun finding rides to enjoy with no drops twist or turns. I will say one thing though to get over fear is to hit it head on . The fear part is the best bit to ride. I no of someone who hated coasters but did it for her grandson , He is autistic, . Now she will ride any coaster including to he list Kingda Ka.
If you want to be brave the Wild Mouse is cool. The maddest and insane ride I have the Pleasure to have ridden.
Revelution is the one to go with first or the bobsled ride. as that is also cool ride.