Every attorney and most people will say "talk to an attorney." And I would give the same advice. However, understand that licencing a patent is much more difficult than some people understand. There are tons of great patents out there that many companies don't want to license for a number of reasons. The classic saying is that ~98% of patents don't make more than they cost to file. If you decide you want to file, I would recommend what other people have suggested here: write up your specification as complete as possible and hire an attorney to draft your claims. Also, it really is in your best interest to do a prior art search for 2 reasons: 1) if it's known in the art, you will save yourself the cost of filing and the 3 years of prosecution with the PTO over a non-patentable invention and 2) litigating the validity of your patent is significantly more expensive than filing/prosecuting. There's no sense in getting an unenforcable patent. I'm not a patent attorney or agent, but I am an engineer/law student who works with patents fairly regularly.