Hi and welcome to the forum
Theres a lot that influences your choice when it comes to your first bike, things like
budget (how much do you want to spend),
your height and build (you dont want something that you physically cant manage, but then if your a larger person you dont want something that will look stupidly small),
personal choice (you've got to look at it, you might aswell like it

)
Good luck with your test, and the hunt for the bike of your dreams.
Mel