Ebay owns Paypal, and Paypal payments are on the total- which includes shipping. Paypal charges the recipient 3%, so "fees" keep adding up. Insertion fees are not too bad. Final value fees, extra pictures, enlarged pictures, start date fee (optional), an extra fee for a reserve, blah blah blah.
People seem to want a low start price and hate reserves. I compromise and start higher if I'm afraid to give something away, but it's a gamble on timing and who sees the auction.
Take the wrapped package to the Post Office and weigh it. You can figure postage at home on your computer, or just charge a flat rate. GET INSURANCE automatically- don't even offer it. Just get it.
Packing is very important; if the item gets to the recipients door damaged, you have to refund their money because they didn't order a damaged piece. That's why you got insurance BTW- it's for YOU to recover YOUR money that you refunded.
Finding the right boxes drives me crazy.
Take big, well lit pictures and describe every stinky detail. A lot of people take pictures in the garage with one bulb left on in the laundry room and all you get is a barely discernable shape. Or, they take a picture of a bike with the sun BEHIND the bike. Total shadow. Bidders want detail.