Guestbook

i have created a working register/login system.. so now i need
to add the function that every user has its own guestbook.
(im using access)
i thought of having a system wich creates a database sub for
every user.
though i dont know wich code that would create this for me..
please help me with that code.
(u dont need to think on the type of system i suggested, as long that
i will get on the right track)
so

database specs:
need to have 3-4 tables:
ID
from
message
(optional) to