
There are a variety of resources available online to help you start learning Esperanto covering the Grammar of, Dictionaries for, and Instruction in Esperanto.
The sixteen basic rules of Esperanto grammar by Don Harlow.
An Explanation of the Esperanto Alphabet and Typography by Don Harlow.
An Explanation of the word-building system used in Esperanto along with some basic affixes by Don Harlow.
Esperanto Correlatives
... What they are, how to use them by Don HARLOW
EspDict
-- Esperanto and English Dictionary (Alwin LOECKX)
English-Esperanto
-- In text format (David RICHARDSON and D. Dale GULLEDGE)
Esperanto Basic Vocabulary -- assembled by Aaron D. Irvine
A Vocabulary list -- Esperanto-English by Neal McBURNETT.
Birds (Danish-Latin-Esperanto)by Byrial JENSEN
Family and Home Terms (Esperanto-Others) by Jouko LINDSTEDT
Mammals and Insects (Esperanto-Latin)
by Wouter PILGER
Mathematics (Esperanto-Others) (Horst HOLDGRÜN)
A Computer Lexicon from Pokrovskij with README file.
A Basic Computer Dictionary by Kalckhoff and Pick (Munchen, 1985). Esperanto/English.
A list on basic computer terms from Martin Weichert.
An Esperanto/English/French computer dictionary with README file.

The Esperanto Hypercourse
the Free Esperanto Course that is available by e-mail from:
you can also find out more about local classes from your national and local organizations or from USEJ's classes page