As a the seller:
Post a single list and delete any previous lists.
Provide a location.
List payment methods.
List shipping methods.
do not ask for "friends and family" payments through paypal. This is a hobby for a lot of people but you are selling goods and services. Don't like it? Don't post your sale.
TOS - Term of Sale including LAG or NO LAG.
Be clear and concise.
Update your list as things sell out and/or if you need to add anything.
Your mistake in wording may comeback and haunt you so proof your ads.
If you get a sale, communicate with the buyer until the package is received and the items purchased are considered "received in good order" the onus is on you to provide any details and make good on your sale.
Please do not come on the forum bashing a buyer without 1st attempting to resolve any issues with them
We do not condone "brown boxing". What you do outside of the forum is on you and if it gets back to us you will be banned.
If you need a mediator, ask, we will do what we can.