well the basic idea is you join and you speak whether impromptu
or prepared.
You can try to just attend one of the session (do not need to join
or pay any fees),just join in.
Even in this case,you will have a chance to speak infront of
everyone if you dare to,normally they will try to invite you to
speak about a certain topic for about 3 mins (impromptu) so well
this is the more scary part
After which if you are interested to join,you pay the membership
fees and you get a set of notes to help you along.
From there you will be making your first prepared speech but such
speeches will be much longer.You will start with the most simple
topic which is to talk about you,basically an introduction to all
the members in a topic you are most familar with.
Also for each session,there is a portion dedicated to impromptu
speeches too so they will just invite anyone to come up and
speak
There are different standards of toastmasters,attainable after
completion of a certain amount of speeches and quality of speech
must pass a certain standard