If you find it difficult to align your images and text in Firestarter, there is a grid option that will help you with this task. The grid menu is found in the upper right hand corner of the preview window:

You can specify the size of the grid, and if you want your objects to snap to fit the grid. Also, with an object selected, if you right click on the object, you can choose to align the selected object to the top or to the left on the current grid.