Were you able to configure Tiled and run the examples?
A few of the examples are quite simple. Start with HelloWorld_TileMap. It is about 50 lines of code.
As XUI2D is based on box2d I recommend you to read box2d manual: http://box2d.org/manual.pdf
It is also recommended to start with B4J. It is easier to develop and debug with B4J.
More documentation will be available in the future. However please post any question you have. Every question expands the knowledge base.