Within a constellation, the stars are tagged with Greek letters in the order of their brightness. The "alpha" is the brightest star in that constellation. Note: The "constellations" aren't only the familiar stick-figures in the sky any more. Nowadays the astronomical catalogs have split the sky up into regions, just like the nations on a map. The regions generally are named for the ancient constellation contained in that region.
The first step to seeing Orion through a telescope is to find the constellation with your naked eye. After identifying Orion by the constellation's characteristic three stars (Orion's belt), you can focus your telescope on the constellation. Depending on where you are located on the globe, Orion will be in a different part of the sky so it is best to check a star map of your hemisphere.
Map symbols help you find particular types of things on a map. Start by looking at the map key to locate a symbol that you are interested in. For example, a large black dot with a white star on it is usually a national capital. So if you want to find a national capital, find the symbol for it on the map key, and then locate that symbol on the map.
55 Cancri (Rho Cancri) is a binary star in the constellation of Cancer. [See realted link for a wikistar map] It consists of a yellow dwarf star and a smaller red dwarf star. They are located about 41 light years from Earth and to date (2010) has the most extraosolar planets (5) discovered round a single star .
Using a star map could potentially be useful as we used the stars to navigate in the times before advanced technology. Since the distance between the Earth and the moon is tiny compared to the distance between stars the constellations you see from the moon are exactly the same ones you see from Earth.