try tongeuing,up and down yourscale ,once you have found it of course,try the rhythm titty tum tum,or tum titty tum.
you have to move your tongue,up to the roof of your mouth,try it slowly on one note say a blow ,then try it on the suck of the same hole.
obviously this will be easier with the pucker technique ,than with the tongue blocking method.
it will be a very useful technique for ornamentation later on.
but as Steve says first learn to get single hole,I use the pucker technique,which has the advantage that your tongue is available for tongueing.
there are some harmonica tracks on my latest cd.
and Steve Shaw has a cd available of harmonica tunes at http://harmonicapics.mysite.wanadoo-members.co.uk