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There's plenty of good resources online that make a good starting point. Some are more detailed than others, but I think the link below would be a good starting point. (I.e. your questions are pretty general, and it'd take a good deal of typing to replicate what's already out there.)
For a shorter intro, I'd suggest the LandNav articles here (6 in all): http://www.itstactical.com/series/landnav-101/ (Downloading the map they use may make it easier to follow along.)
Once you've got a good handle on the basics you should be able to ask more specific questions, and we can point out other ideas (e.g. using "handrails", common sources of error, etc.)
Note: one thing that link doesn't really cover is triangulation. You can find all that and more here: http://www.compassdude.com/default.shtml (In the wild one hill can look much like another. They don't all come with large signs saying "Hollywood", which means unless you're really sure of your target, there will be guessing involved. On the other hand, if you are really sure of your target, you probably don't need to triangulate.)
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