Is creating own Terms and Conditions legal?

I created an own Minecraft Server and a webstore and I just want to know if it is legal for a normal person without a company to create terms and conditions for a payment on the webstore.

When you create a terms and condition by following the law and rules then creating a term and condition is legal I think so.
So at the time of making terms and condition always take the advice from the legal adviser and always try to pay attention to the rules and the regulation then it is good of you.