Small batches, honest counts
If you made six, say six. A stock count that matches reality closes the listing when the last one goes and saves you the message that begins with sorry, that one sold. Restocks are a reason to post again rather than an apology.
For made-to-order work, put the lead time in the description and treat it as part of the price. Two weeks stated up front is fine. Two weeks discovered after ordering is a complaint.
Show the making, not only the made
Photographs of the finished piece sell it. Photographs of the bench, the offcuts and the half-finished version sell you, and you are the reason someone pays more than the factory price. Keep one making shot in each listing.
Commissions start in the thread
Most handmade income eventually comes from custom work, and custom work always begins as a question under a photo. Because the shop opens inside the chat, that question lands in the same place as the order. Answer it there, agree the piece, and list it as a one-off product so the payment and the record follow the same path as everything else.
Price the postage separately and plainly
Makers routinely absorb postage and then wonder where the margin went. Put it in the shop as its own line, say what it covers, and stop discounting it quietly. A buyer who sees the real number does not think you are overcharging; they think you are organised.