For your first glass toy, I suggest something without extreme texture and a small girth. Both the Ocean Bliss and Blue Spiral G have a lot of texture.
Within the same price range, you could check out Blue Hearts
which has some texture, but not much, or the Cyclone Wand
which has no texture.
Or, alternatively, you could go with something that has two types of texture, bumps and spirals, so that you can decide what you like. Pink Allure
would be a good choice, as would Bumpy Spiral
and Royal Duet
The main issue you're going to have occur is possible internal bruising with a partner. Just make sure that you've used the toy before on your own so you can communicate what you like and what hurts with your partner. Keep the communication open and going and you should be fine with any of these.