Wash500,
Buying and recommending a scanner requires we know a bit more about your PC. Is it Windows? If so, what version? Is your PC older (32-bit) or a newer one (64 bit)?
The following assumes that you will be selling quite a bit on
ebay over an extended period of time.
1.As far as
ebay goes, consider establishing a separate bank account/credit card strictly for this purpose. Put a few hundred dollars in it to start it up but keeping it separate from your household monies is best.
2.Be prepared to have eBay/PayPal hold you money until you have some history with them.
3.Having a PO box also insulates you a bit from the possibility of having someone learn exactly where you live (in case you are concerned about robberies/break-ins).
4.If you plan on selling individual stamps you will want to consider scanning the back and front of each stamp; this greatly helps the buyer understand the quality of your material and will ultimately save you time. (Less answering pre-sale questions and less returns.)
5.Fully describe each item but do not add a lot of marketing 'fluffy'. Saying things like 'post office fresh' can mean a lot of different thing to different people and only opens the door for a buyer to return thing on your dime if they do not on the same page as you.
6.If the stamp has any faults, describe them fully.
7.Consider selling only to North America until you get your feet wet. International shipping can be expensive and can involve some difficult water to navigate; some sellers have problems with 'non-delivery' to certain countries.
8.Starting out do not get sucked into paying for listings and features; utilize the free listing offered by
ebay until you fully understand how it works and the best way to sell for you. If you end up selling a lot (like hundreds of items each month) you may want to open an
ebay 'store' but don't jump right into one.
9.Become familiar with doing 'Look ups' (searches) for existing material on
ebay. You will want to pay attention not to other listings but to other listings which SOLD. Note if they were sold as an auction or 'buy it now' mode. If an auction, note bidding history (see what the item was started at).
10.If you want to sell at auctions, many people feel listing them to be sold during the weekend will result in the most attention. You can build listing at any time, save it as a draft, and then roll it out at the time that you feel is most advantageous. (You can also schedule a listing but this costs money.)
11.Use the 'built-in' categories to get the highest amount of search hits for your listings.
Let us know about your PC a little and we will make some scanner recommendations.
Don