XOD is a flow-based programming language as opposed to more popular imperative languages. That means some things are much easier to do in XOD, but other things are not so obvious. Particularly, for a newcomer, it could be hard to understand how to control the order of execution: do a thing first, then another thing, and only after that do the third.
We described one possible solution to do jobs in a sequence in the new guide article: 
Simple Traffic Light Example. Hope you will find it useful. Feel free to ask questions, and make changes to the article if you can make it better.