1) Educate yourself via reliable books. For example books by Ilan Pappe (Ethnic Ceansing of Palestine), Edward Said (The Question of Palestine).
2) Educate yourself and track current information and key historical data via websites (and disseminate it). For example look into http://www.imemc.org/, http://electronicintifada.net/, http://english.aljazeera.net/, Encyclopedia of the Palestine Problem, Palestine Remembered, and similar websites.