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In order to give an estimated value it is necessary to know which coins and stamps are in the collection.
There were no postage stamps from 1777. They were first used in 1840. You must be referring to stamps commemorating something that happened in 1777. You will have to identify them in a catalog to determine the value.
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It all depends on your collection. Evaluating a collection is difficult and takes some research. Most are going to have minimal value. If you don't know what the value is, chance are you have many common stamps and little of real value. If you had purchased valuable items for the collection, you would already have a good idea of value.
The value of a stamp collection will depend heavily on which stamps are included, some being far more collectible and desired than others. Value is also determined by the condition of the stamps. An unopened kit collection is not always worth more than a randomly collected and handled collection. While the kit stamps will often be in pristine condition, they still must be specifically sought after in order to be worth money to a collector.
Dealers typically sell them for $1 apiece. You would be lucky to get half that from a dealer. There are a few stamps, usually high values, that have a bit more value.
You can purchase a mint set of all 29 1980 stamps for around $26.10.
The value of stamps is determined by their value and rarity. The value for a 1993 Elvis Presley complete stamp collection in mint condition is between 99.00 and 130.00 as of 2014.
There is no easy way. You will have to identify the stamps and their condition and then match them against the catalogs to find their retail value. For many collectors this is the fun of collecting, hoping to find that $100 stamp in a collection they paid $5 for.
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.
These are not from 1870, that is the date of the locomotive pictured on the stamp. The value is about 15 cents to buy one, but you'd be very lucky to sell it for face value.
This can take a while. From what I can tell, 1993 Duck stamps are worth a little less than twice their face value. The link below provides a catalog of all the state stamps and what you can purchase them for. Good luck!