Interact with the physical world. Form up into units of strength. Go before the authorities and demonstrate that you have numbers and strength (never "protest" that is weak and useless). Be polite and talk to them but let them subtly by just a organized and disciplined show of numbers so that they respect and even fear you. They will join you or when the time comes turn the armory over to you.
The more in positions of authority and physical control you can bring into your ranks the better.
If you are a leader, lead. If not find a group to join. Competence, intelligence and realistic view of the world is better than ideology. If a group breaks down into stupid chanting and yelling, try to determine the infiltrators and take names on lists, and find a real action group.
Get technical people. Think TV, cable, phone, power, water, sewer. Get police and government, and army people on board also.
This is not about rioting and killing, but preparation for war with the Enemy of the People. This is about saving your community not destroying it. But nevertheless it is war and all that entails.
Get a command structure. Become disciplined and enforce discipline. Build a communications network. Build an intelligence network. Build a recruitment and training network. Mostly this stuff is already there, just find it.
Spend time offline. Go on maneuvers. Personally: Become a trained rifleman. Be a minuteman. Be ready to join the battle at a minutes notice.
In summary: Get out more and interact with people. Build your network and get involved.