I'm fairly new to Airbnb as well (9mo), but I have been listing my units on another platform for years. Not being able to contact a potential guest directly does make me nervous, and there have been a few times I've turned social media just to get a feel for the person.
I haven't been burnt yet on Airbnb (knock on wood). First you should make sure your settings are such that you have to approve guests who have no reviews. I ALWAYS contact the potential guest and ask for info before pre-approving. Sometimes that just means asking about who will be staying in your home and why they are travelling. Open a dialogue. You can get a feel for who they are pretty fast, and that always helps.
It's also good to know that if you allow Instant booking for guests that are reviewed, you can refuse the booking if you are uncomfortable without penalty.
Keep in mind, you will be able to review them as well.
Welcome to Airbnb!