To create a macro:

C-x (

Once in macro recording mode, enter a series of commands. When finished:

C-x )

To name the most recently recorded macro:

M-x name-last-kbd-macro

Enter a name for the macro. The name will now be accessible as M-x <name>.

To generate macro elisp suitable for reload, run M-x insert-kbd-macro and enter the name of a defined macro. Paste the resulting code into ~/.emacs.