To work with git is necessary to install git software on your pc. Download Git from here '?http://git-scm.com/download/'. You only have to select your OS and install it.
Before working with a project in Eclipse located in a git repository it would be necessary to install egit plugin and egit mylyn connector.
To import a Mavenized Git project from remote server, m2eclipse needs the git SCM Connector. You can not find SCM connector manually in Eclipse Marketplace ?http://stackoverflow.com/questions/6981001/m2eclipse-no-connectors-for-scm, so that, Go to File > Import > Check out Maven projects from SCM. Click on Find more SCM connectors - Eclipse Marketplace, type m2e-egit and follow the installation wizard.