There are some online stamp catalogs available. I often use the one by Mystic Stamps. They have put their paper catalog online and it includes information on how to determine condition. The values provide are those at which they are willing to sell the stamp. Buying will be a fraction of that value.
Online sites that have stamp value guides include Stamp Collecting Resources, Stamps Site UK, Hobbizine, Find Your Stamps Value, Stamp Treasures and Mystic Stamp.
Stamps typicall see an increase in value after the 1st year on the market. This does vary depending on the stamp.
It is very difficult to determine value without actually being able to examine stamps. There are catalogs online that can help identify the stamps and provide a general value. Condition is important to determining value. And the actual value is not necessarily what is in the catalog. Most dealers will pay about 25% of the catalog value, particularly for low value items. If it is a high value item, you may be able to get more for it.
If they are the non-denominated US stamps, there is an identifier on the USPS web site. For collector values, check an online catalog, such as Mystic Stamps.
There are a number of online stamp catalogs available, some do charge a fee. Others have a catalog with prices to purchase stamps from them, but it can give you and idea of value.
There are many ways one can learn the value of stamps from Japan. One can learn the value of stamps from Japan at popular on the web sources such as Baxley Stamps and Herrick Stamps.
There are several websites that offer personalized stamps. It is suggested that you consult such sites as Ebay or Amazon and see if they fit your specific needs.
That will depend on the year and condition. There are those that specialize in collecting such stamps. You might check online auctions to see if you can find similar items.
Use a catalog to find values. There are several available online, such as Mystic Stamps. You can also find paper versions at most public libraries.
Yes. Canada Post sells stamps online.
You can purchase craft stamps online from stores such as Etsy. Alternatively, you can also purchase these stamps online from retailers such as Overstock.
There are a dozens of stamps issued in the 1980s. You will have to consult an online catalog for information to figure out which one you have. That will provide you an estimate on the value.