No such thing as a bad business idea. Just bad implementation, or lack of originality.
Write down every idea you have, in one place (I use a Notepad file) no matter how stupid or senseless or redundant it seems. If you're watching a porno and come up with an idea, pause the porno and go open your "ventures file" and add the idea (or maybe write it down on a spare tissue and add it later
)
Once a week or so, open your list and prioritise it by amount of money/work requried, likelihood of success, perceived return:risk, etc. Do a little online and offline research for each of the top one to five ideas and add it to the file.
Most of what you write down will never make it past a few words or couple of lines on the file, but gradually the better and best ideas will find their way to the top of the list, and as your knowledge of those ideas gets filled out, you'll start to develop plans for them -- and even start seeing connectons, ways you can "cross-build" two seemingly disparate businesses using the same resources (common software or support staff for example.)
Before you know it you'll mot only be in the process of setting up a business for yourself, but you'll have a few other ideas for what to do next or even what to do as a backup in case the first one doesn't work out.
In any event, I wish you success!
Phaedrus