I'll just give you a few pointers:
- go with silicone, or if you're pressed for money (/points) TPR
- consider something curved - you'll have a chance to try g-spot stimulation
- pick a modest girth (Dangerous Lily says in her amazing guide
about 1-1,25" I'd only add Tantus Acute to her recs)
- don't put too much hope in rabbit vibes. They can be great, but there is no guarantee you'll pick the one that goes with your anatomy. It's always safer to pick a quality silicone dildo and a nice but cheap 4-vroom bullet.
- take advantage of the "refine" function while browsing - you can narrow your search easily.