Your English is very good. You can use VLC to transcode to H.264 and then create a .stream file containing the url for the stream which you'll start in Stream Manager. You could have multiple instances of VLC and point to multiple Wowza applications.
Sounds like you are doing it right as far as starting streams and playing them back. The ugly result is probably a result of bandwidth limitations. Try with one stream, and try each of the different streams one at a time. If they are all okay one at a time or at least much better than with two at a time, that indicates bandwidth problem between VLC and Wowza.
Also, test with Wowza LiveVideoStreaming Flash player running on same server or lan, to see how the streams are playing factoring out Android.