Raising money peacefully:
1. Donations only work if people know you and like you. So get popular first. Activism and maybe some community service is good for this.
2. Other legal fundraising options require skill to capitalize on. You can liberate sweatshop workers from the textile factories in the industrial district that have high levels of garment making skill and can sell T-Shirts for money.
Not getting raided:
1. Don't use the homeless shelter as a base for violent actions, it's the first place they look. Go to a warehouse and invest in a business front to throw off investigators, or rent an apartment somewhere to blend in. The more expensive the apartment, the less likely the police are to search for you in that neighborhood, and the harder it will be for them to find your safehouse.
2. Alternatively, or in combination, you can move around every few weeks or so, or even more often if that doesn't work, to shake off any investigation. Leave bases you've been resting in for a long time empty for a few weeks to let them cool off and be forgotten.
3. If you do get raided, and manage to fight them off, don't stay in the same place. They already know where you are and already know you're ridiculously well-armed and dangerous, so they'll just come back in a week, this time with national guard troops. Best to be gone when that happens unless you're looking for a fight.
Not getting arrested:
1. Avoid sending important people to do dangerous things like selling brownies. They're really not safe.
2. Avoid sending wanted people to do legal things in public. You may just be manning the t-shirt stand, but if you're wanted for murder, the first cop that knows your face will be able to bring you in.
3. Keep a reserve of cash for emergencies -- $5000 or more. If you have enough money, you can hire an ace defense lawyer that has a high chance of getting you acquitted at trial.