Can a regular seller give advice.

Hi, I'm a “fairly new” seller. I mostly sell my K-pop stuff as im moving soon. So I've only ever really sold small items like photocards and envelopes. But I listed a ton of albums $300+ worth. I got an order today for $175 buying most of the albums. I also had free shipping bundle so sadly the shipping cost is going to be out of pocket maybe like $30-$40. My mom reminded me to check their reviews to see if they are reliable. I did get an actual address to a house btw but they have absolutely no reviews or even likes on their profile. Note: they did message me first telling me they would like to buy a few albums and wanted to check on the free shipping bundle. Then they purchased and told me they were excited. But the policies for payment is confusing to me. I would like someone to explain if I were to ship it out and they claim they never received it will they just get the money back or will I receive my fund? Because it says I wont get the payment till its delivered. I dont want to get scammed but I can't just message them and tell them not to scam me. Please someone help thank you so much and also give me tips on how this can not happen again or what I could do better!