Hi from another Canadian,
what part are you from?
To help you with your question about opening your own business, a lot of us do and are successful. One most important thing is your civil status here. Are you married to a Swiss national, have you any permit to work or live, do you have an open AVS? Do you have health and accident insurance in place?
For any new business, you need to be able to communicate on a professional level in the local language so you can fill out the forms, talk to the governement, etc etc. Or have someone who can really help you with this all the time. If you wish to stay in the cleaning area, you don't need any papers to prove you can clean, if you were doing something like surgery, then you need documents of license of course.
You need help to pay your taxes, pay your AVS (retirement fund), book keeping, plus other legal items which are impossible to cope with if you cannot read or write in German or have someone who can help you at a moments notice.
So you can do it, but it will be tough without German.
Call your local federal registry and ask for documents to read about new business ventures.
Good luck!