FIrest you will get a invitation in your gmail mail box : So here is the mail from the person you will get invited now click on the button join google.
Now the time for sign up proccss with some few simple steps :First enter your FIRST NAME , LAST NAME , SELECT GENDER and finally add your photo.
Click On - Google may use your information to personalize content and ads on non-Google web sites.
Now you will need to edit your photo and resize/crop it as you want. This picture will be your profile picture. and after you have done cropping please click to set to profile photo.
Now you have done yout google+ plus profile. Your home page you look like below :
IF YOU WNAT TO HAVE A GOOGLE + PLUS INVITATION PLEASE COMMENT ADD YOUR NAME AND EMAIL ADDRESS. I WILL SEND YOU A GOOGLE INVITATION.