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Hi everyone, this is my first attempt at bonsai and I started with a Yamadori 3 months ago and I already got some life into this Chinese elm... So far so good, I think the tree is out of the woods. I live in Los Angeles and the tree is outdoors. It rarely goes below 50 F in the winter so I'm thinking it would stay outside this winter or should I bring it indoors? I do have a small nursery with lights and fans and at home, the temps run about 73 F during the winter.
I've attached some pics of the current state of the Elm tree. So my questions are the following:

1. Should i leave the tree do it's thing and develop a strong set of roots over the winter outside?
2. Right now it's not much of a bonsai but merely a potensai surviving. Any ideas as to when to cut those ugly branches to begin training? Once I cut the big ones, can I use wood glue to cover the wounds? Any suggestions on styling?

First are you sure about the species? Next do not put it inside ever. 10C is hot for winter.It looks very dry also. and it is lacking in growths so it needs to be allowed to grow. No it is not bonsai and has years to go before it could be considered such.

Nice find.
Leave it outside. It prefers to have a winter, even though you do not get much of it.

Your tree is NOT out of the woods. It is now growing on reserves. So you need to let it grow for a year to really recover. After that you can start looking at cutting back further and setting the basics. But first.. Get it healthy.

My gut reaction to this is no fertilizer. Is that right?