Collect signed petitions. Do not let them remain uncollected for more than one week. Supply clipboards and attached pens. Contact the managers of your local malls, marketplaces, supermarkets, etc. Consider setting up a table.
Appearance is very important. . .
Be sincere, honest, knowledgeable, non-threatening. Have hand-out materials with you . . make sure the articles you have with you are from credible sources. HSUS articles are very effective, because everyone knows them. As soon as you collect the petitions, make sure photocopies are made. Place the originals in a safe spot.