Metamask Code to Nft Gaming

Hey good afternoon!
I would like to know what value I would charge to develop a code (I would like to be able to edit the values ​​and also the recipient wallet) to add to my website (wix) in a button connected to the network (METAMASK / Blockchain) where the user clicks and already opens a transaction via BSC-BEP20 to purchase some items from a future nft game.

I understand a little about Javascript programming but I would need some help so that I can put it on my site and link to my portfolio as well as change values ​​for various items.

What would be the value to create this code and help me to add it to a button via wix?