This is a great song. i don't get why there aren't already loads of tabs for it so here 
one of what i hope will be many.
                 C     D7                G
Welcome to my world.    Won't You come on in?
             C                            G
Miracles I guess   Still happen now and then.
               C    D7                      G
Step into my heart;    leave your cares behind
               C    D7                    G   C  G
Welcome to my world    built with you in mind.
 D7                       G     D7                 G
Knock and the door will open;  Seek and you will find
D7                 G         A7                    D7
Ask and You'll be given  The key to this world of mine.
                 C   D7                  G
I'll be waiting here    with my arms unfurled,
                  C   D7                G    C  G
Waiting just for you;    Welcome to my world.

Takes a while to get used to but it still works.
Peace out

(one line instrumental)
C  D7  G


                  C   D7                G    C  G
Waiting just for you;    Welcome to my world.