Greetings and welcome....
May I suggest you visit:
http://torontobonsai.org/
This is the Toronto Bonsai Society. They are good people and can best help you locate a source for trees. If you can, try going to a meeting. Meet these people first hand and ask questions. Plus a club is a very good source of info.
As stated above, indoor growing is not the same as outdoors. Many many trees can NOT be grown indoors. Even those that can (tolerate) growing indoors need special attention. And PLEASE...do not but from Home Depot, Wal-Mart, Lowes or the equivalent.
my 2 cents
Jay
please explain 'left outside will be destroyed'? by animals....wind...etc?