I'd like to add that registering to vote is the first step.
Researching the propositions (and candidates for that matter) that get put on the ballot yourself (LAO[1], SOS[2], Ballotpedia[3] and Google) and ignoring media coverage/ads can make a huge difference.
The Legislative Analyst Office (LAO) is particularly useful. Their analysis of prop 1[4] combined with Ballotpedia's[5] summary was very informative.