Can your Terms and Conditions be anything?

I've been making a Terms and Conditions for a donation store for minecraft and i was wondering if anything i write on it is binded as a legal contract without no hassel?
Or do i need to verify it with a company? I'm a little confused.

For example:

1) You are making a "donation" to our server, regardless of the terms used by any third party company (Enjin, Paypal) In return we're giving you a "gift" for your donation. You are responsible for this gift, and you will not be refunded. Everything that is, or was said to be given to you, does not NEED to be given. The items/perks are a way for us to say thank you for keeping the server running.

Am i allowed to say that? OR do i need to verify it with a company to make it a legal binding.

SORRY IF THIS IS IN THE WRONG CATEGORY.

In other words, you are selling something with no warranty, in exchange for a "donation".
You need a lawyer to draft this for you