How can my users sign up for a blog using membership & buddypress

Hi I am building a user community on buddy press but want to give my users the ability when signing up to create there own blog. The blog would have different options depending on the membership 2 package that they create. So when someone new comes to the site they can sign up for a free member different paid packages that include different services like there own blog on my multi-user network. Please advise.