One of the easier methods is to use the AutoExec macro. Create a macro;
name it "autoexec"; then set its actions to open the form you want; and
maybe minimize the database window, hide the toolbars, etc. When the mdb is
opened, the autoexec macro is called and all its actions are run.
A slightly more involved approach would be to create a Switchboard type form
to serve as an on-screen menu. That form would have a series of command
buttons to open
your other forms and reports.
And perhaps lastly and easiest, most version of Access allow you to
designate a startup form. Use the <Tools><Startup> menu to set the startup
conditions for your mdb.
-Ed