Start a group. Don't call your group anything with "party" or "revolutionary" in the name, because it's extremely unlikely that you'll be big soon, and so having these words in the name would make you look delusional.
I live in a country with lots of parties and various small radical groups. There is a common horrendous habit of radicals (also of moderate parties, but more so with radicals) that they carry tons of pamphlets, books, etc. to all sorts of events where these things are offtopic. The reason they carry it is because they rather not throw it in the trash. This is a mistake. You don't like offtopic spam in online discussions. People certainly don't like the offline equivalent of that either. Make pamphlets that directly relate to the protest you are attending or don't bring any.
Don't sell newspapers. DON'T SELL NEWSPAPERS. DON'T EVEN THINK ABOUT EVER DOING THAT. Don't. Don't sell magazines or booklets. Ever. You want to reach people. A person reading your stuff is doing you a huge favor, is giving you attention, a limited resource, don't ask them to also pay money on top of that.