New to Google+?
1.) If you haven't put up a photo for your profile pic, please do. People are less likely to circle you back without a photo.
2.) Fill out your profile by clicking the third icon above (the head inside the circle), then clicking the "About" link, and then clicking the blue "Edit Profile" in the upper right corner.
2a.) The summary below your name is good to fill in, but be sure to fill in the Employment section, especially the first box of it, such that people have a sense of what interests you. This is what people will see when they hover over your name or your photo.
2b.) Putting a few links to find you elsewhere on the right is a great idea. Putting too many links there might result in people not clicking much of anything.
3.) Not sure who to circle? Find people you think are interesting and see who THEY have circled, and barring that, look at who comments on their stuff.
3a.) Want more? Go to http://findpeopleonplus.com
to find more folks.
4.) When adding people to your network, make sure to use the Circles feature to keep them organized however you'd like them sorted. The more work you do on this up front, the better the platform works later.
5.) Getting too many notifications? Change your settings here - https://plus.google.com/settings/plus
. That also is the link to edit your security settings.
6.) Want a bit more? Swing by http://chrisbrogan.com/startplus