Honestly you are way too skinny to be running prohormones. And it is not something you run once and you will be set for life. You will most likely lose most of the gains, if not all, within a month or two because you are skinny which means you are not eating like a beast to gain the weight and maintain it. I'm sure you think otherwise though.
I hear AnaBeta incease appetite a lot, and people reporting great gains on it. if your goal is to gain 5-10lbs, be safe, and not deal with loss of libido, it is a safe bet. Even Some PH users use it. You could add natural test boosters such as DAA too. I will be running this combo myself starting Today.
Steroids are only safe if done right and it is a way of life. It require certain eating, training and supplementation habits. They are not a one time fix thing.
Do what you feel best, if you choose to go the steroid route, any safer steroid will do good job since it is your very first cycle. But you will lose libido and you will most likely lose the gains after a while.
Good luck, and continue your questions in the Anabolics section if you have other questions.