Hello Totocalimero,
Four are from Great Britain from the 1800's, and one (the fourth from the left) is from Victoria (an Australian state) from 1901. A fun little selection showing cancels from London, Aberdeen and Victoria, as well as a numeral (816) cancel which may be an identifiable town.
What kind of help are you looking for? Do you want to start collecting stamps?

These would be great to give to a child starting to collect stamps.
If you are looking for value (money-wise), catalog value is less than $10, and realistic price you can get is probably $1 or less.