1. Set up a solid profile
2. You must create a profile open for searches, so anyone can access it
3. Add relevant images
4. Add videos to your profile
5. Optimize links to use keywords
6. Use the circles to communicate with customers, media and more
7. Use comments, share, and the + button to improve relations and interact better with the rest
8. create a personalized url shorter for Google Profile +
9. Invite the already existing contacts on other social networks
10. Update frequently with fresh news
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Thanks for sharing useful tips for marketing on Google Plus. We are personally more concentrate on Google Plus marketing because we think that Google gives more weight to own products. According to my experience Hash Tag(#) use in keywords are make more effective to post.