Their is a nice book for complete beginners
Phylogenetic Trees Made Easy: A How-to Manual
here you can find some important definitions
also here is some papers that will give you more insight .
This is just appetizer more can be found
Good luck :)
Starting with some nice, easy to use software is good too.
If you are on a limited budget, then MEGA offers some nice ways to explore your data. I had the pleasure of attending a talk by the developers of MEGA at the SMBE conference earlier this year - despite it's ease of use, the developers really do care about getting things right.
If you have money to spare, then Geneious is absolutely wonderful.
I used these as an early student of phylogenetics research, and have recommended both to other students and found that they learned a lot from playing with them.