In basic the fees will be about £8 to list it, then they will take 10% of the final selling price if you do it by auction or buy it now.
A classified listing is my preferred way of selling cars on ebay.
The fee is higher - £15 or so if I remember correctly ( been a while now), but you can list it for 30 days and it tends to keep the nob ends away.
An auction may or may not get you the price you want. You can introduce a reserve, but then some people always want to know the reserve, and will then approach you to sell it off ebay for that amount (coz that's the minimum you're prepared to take). IMO it's annoying and ebay take far too much. £108 for a car you sell for £1000

Too much money lost IMO
Classified ads will still attract people, but a sale may take a little longer so no good if you want a quick sell.
You can put things like "open to offers", "advertised elsewhere" etc, as ebay don't take any further fees.
It also attracts a more serious type of buyer, so less time wasters. But always be as honest as possible and list as many know faults as you can, but highlight at least two positives for each negative. That way buyers are not put off.
Don't say things like "needs doing". Why does it need doing. Is it because it's too expensive that's why you've not done it????
Don't photo it outside your house. Find a nice grassy field and take the photos there. I nice background in the photos helps entice people to view.
Always make sure it's viewer ready.
Finally, price it in mind that people will want it knock you down and make them think they are getting a bargain