Thanks for the feedback! I apologize for the crashes, they are likely due to you right clicking while you have a planet selected. This was an oversight on my part and it has already been fixed in the next version that I'm currently working on. Good point on the view scrolling, I can see how that would be annoying when checking on things outside the game window.
As for how to make additional ships, when you have a planet that you control selected, you will either see a button to build a space station (currently named Babylon 5), or, if that planet already has a space station, there will be buttons to build the different ship types. Adding in tooltips and additional visual feedback as to what you have selected and what things do are for sure planned.