Multiple purchases is always better to give the buyer the option.
But it's difficult to put them in a multi listing as coins will all differ with grades unless they are pre-packed from the mint.
I would sell individually and have in all my listings that multiple purchases can be combined for discounted postage.
Unless there are a lot of very low value items then as a bulk lot of 10 or 20 coins might be the best.
As for postage, letter is supposed to be document only but if they are sent as large letter $2 they can provided they don't exceed 20mm thick. (fit into a normal letterbox slot) If multiple purchases are made they can often go in a padded encelope as large letter.
A good idea to start with a few and work up so you know how eBay selling works.
As well, you will probably be limited to 10 free listings per month being a new seller.
So listing as Buy it Now for 30 days is probably the way to go.
Auctions aren't what they used to be on eBay and many buyers don't want to wait until an auction finishes.
Auctions are good for rare items that may get multiple bidders fighting for it.
Hope this helps and don't hesitate to ask further questions.
Yes you simply do a listing for one coin and enter 20 in the quantity field then the buyer can select 2,3 or however many up to 20.
It will also show as how many have sold in the history and that can improve it's ranking in searches.
(if they are silver prrof coins then they seem to be selling for $55 - $99 each)
On the satchels, that is a good question because sending items as large letter doesn't have tracking (although I believe it's available soon if not already)
Higher value items are best sent with tracking so you are covered.
There are buyers that know the system and if they see an item sent without tracking, all they need to do is open a case for INR to get the money back. With tracking you are covered for delivered items and if items are expensive then perhaps signature on delivery is better. High priced items, buyers won't mind paying $20-30 on postage.
dave makes a good point on multiple listings as counting off your first freebies that i forgot about.
I would list perhaps 3 of those coins in quantity and in a good to cancelled listing so the history continues then you can always add to the quantity as they sell.
