Thanks for re-capping my thoughts, you did a good job. There is one point that I would like to clarify though. Apparently I neglected to note earlier that Chinese Elms are sub-tropical
, this is what makes them suitable for this type of culture. I would never try to keep a truly temperate
tree inside at all. Some growers do (with the proper rest period) but this requires a certain level of skill and good attention to detail. It just goes against the nature of the tree and since I have space outside it simply is not worth it to me.
I know there is something you can buy to tell you if it needs watering, but don't have any idea where I can get them
Don't buy the moisture meter, it is unnecessary. Have you read the sticky I mentioned? There is reference there to something called the "Chopstick Method" look into that. It requires no purchase and will allow you to spend your money elsewhere, like lighting. Also use the search button and look for threads/posts that mention something called a "Humidity Tray"
He told me to buy baby bio plant food
Specialized fertilizer is not necessary either, pretty much any general purpose fertilizer that is not too strong will suffice for now.
He told me just to put it out side now and again but didn't specify how long an when.
Since this is not a possibility for you it is a moot point.
Stop back after you have done some reading and have more questions. Please follow the links to Bonsai4me and Evergreen Garden Works, they are in the sticky threads and all over this site. The articles at those sites will answer a lot of your questions.