You will need a stamp catalogue to identify your stamps. Try you library first as they are expensive, several hundred $'s for a new set. Your stamps on that page look to be pre-1940, and there is a single catalogue known as the Classic Specialized by Scott's which deals with all the worlds stamps issued from 1840-1940. Sometimes you can pick up an older used copy online for just a few $'s. You will then have to determine the country that issued the stamp, and the country name is usually on the stamp, except Great Britain which was exempted by the Universal Postal Union (UPU) back in the 1800's when this organization was formed to expedite mailings between different countries. The reason they did this was because Great Britain was the first country recognized as issuing postage stamps, and their early stamps didn't include the country name, and still don't, and to honor that the UPU exempted Great Britain from having their country name printed on their stamps.
Of course the countries spell their names in their own language, as an example stamps from Spain will have Espana on them, and so forth. Also some countries use different alphabet characters, like China, Japan, and Ceylon, that can be difficult to identify. A stamp identifier book will be useful in finding which countries the stamps are from so you can search the catalogue for that particular stamp. Stamp identifier books only cost a couple of $.
Good luck in your search on these stamps. I will be happy to assist you in any way I can.