I have a Knitmaster 700 with ribber, colour changer and weaving arm and a Corona Jumbo - all sadly packed away until space becomes available.
Francesca - try and get hold of books by Diane Bennett. She has now retired and I don't think she is selling them anymore, but they are quite often available on Ebay and Amazon. Don't be put off by the dated pictures on the covers. I was lucky enough to be taught by Diane many years ago and she was quite simply the most natural teacher I have ever met. I remember her first piece of advice was: " If you put your machine away under the bed you will never use it". I agree with the others in that you should put away the ribber and the colour changer until you have got the hang of single bed knitting, and, if you don't already have one, get a charting device (Knitleader, I think for Brother). Finding suitable patterns is a problem and it will allow you to knit any shape you like, in any size you like, in any yarn you like, at any tension you like.