Create a Simple Module

I have had trouble with the GUI, so I've exported the filter created thus far too work on it by hand. However, I am new to module development. I did not use the hook_install, as it seems unclear whether or not I need to do so. Now that my module is installed, several checkboxes have shown up under the "Load a Default Flexifilter" tab, each with a single character alongside, or no label at all.

Clearer instructions, or a more basic example of using hook_flexifilters that flexifilter_cite to create a module would be very helpful.