That's a very complicated for PHP 10,000.00 business. You might put a request tickets as well. You might end no $ because of the lawyer's fee.
In this type of business and scale (I assume that it's not big because you're doing it alone), why cant make your client as your partner? Dont feel them that they are not your friends by signing them lots of papers. Trust is the key and just be honest to your clients and charge them according to your man-hour. In this way, if they will have lots of requests, you just charge them by hours.
If it's complex, it will take time, then you charge more. Dont think about additional charge for intellicatual property because there's nothing intellectual there unless you discovered a breakthrough algorithm.




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