It is good to hear you are interested in collecting these. Sorry to say these are, at first glance, all of minimal value, a couple cents each at best. This is true of the vast majority of stamps you'll encounter; they are still very, very common. Now there may be exceptions to that here, which I'll try to explain.
Sweden is big on issuing coil stamps, ones that come in rolls. All the ones with two parallel sides without perfs/imperforate are coil stamps. Many regular issues/definitives come also with all four sides perforated (from large sheets), or can come with one side imperforate (from stamp booklets). Each of these are considered different stamps by collectors.
Per your numbering:
1. 15 öre 300th anniversary of the death of King Gustav Adolf, issued 1932.
2. 15 öre 300th anniversary of Swedish postal service, from 1936.
3. 5 öre King Gustav V, the then-current king, a regular issue/definitive from 1911.
4. 5 öre lion. There are two that look the same, both from 1920. If one has a watermark of curved diagonal lines widely spaced, it's the better of the two but worth perhaps 25c.
5. 10 öre lion, considered to be from the same series but issued in 1921. Again, two types, that watermark again being the better of the two at about 25c.
6. 30 öre lion, issued in 1920, similar comment following the last two, although if watermarked, the value would jump to $6-10.
7. 10 öre King Oscar II, first issued in 1891.
8. 15 öre King Gustav V again, issued in 1925. Note the ragged left side; this is a fault to collectors and reduces value severely. Not worth much anyway so it can be kept or not.
9. 15 öre von Linné (Linnaeus) commemorative, from 1939.
10. a duplicate of item #9 but a better one.
11. 45 öre Nordic Cooperation Year, from 1969.
12. 25 öre and 30 öre King Gustav V, both issued 1911. 25 öre with corner damage.
13. 20 öre Nobel, from 1946.
14. 2 öre arms of Sweden, two possibles here again, watermarked with a crown from 1910 and worth about $2. Watermarked with the lines as noted above, from 1911, minimal value.
15. 1 kr crown and posthorn, from 1921. Perf faults at left.
16. 5 öre Bellman commemorative, from 1940.
17. 5 öre yellow green looks to be mint. If so, with gum worth about $1.50, half that or less without gum. From 1891.
18. 15 öre Swedish settlement in America, from 1938.
Dates given are the dates first issued. Many of these were available for several years and may have gone through several printings.
Now, consider going on and checking these and maybe others for yourself in a Scott catalog, an alphabetic multi-volume worldwide reference and price book. The numbering system is used universally in the US. Scott is generally available in the reference sections of libraries, sometimes with older volumes available to check out. It is not necessary to have the latest version except for some pricing changes. Here's the Sweden section of an online worldwide catalog, not as detailed as Scott:
https://www.stampworld.com/en/stamps/Sweden/Always feel free to post questions on this site, though you can find a lot for yourself as you've probably already done by searching it. For a reply, you might just be given a link. If you still have questions, go ahead and post them.