Sounds wonderful in principle but I guess what you realy want to do is see your idea being utilised and creating a free for all may not be the best way to achieve your objective.
Some inventions require extensive development and tooling etc. for manufacture yet have a limited market which you will fragment with your approach, possibly making it unviable for any or every business capable of bringinging it to market to ever do so.
Consider taking the rout suggested by Phil and then think again berfore adopting his final step of letting the application lapse.
Sure - the best way involves you needing to incure expenditure on a Patent Attorney otherwise you could have stab at it yourself - you should get the best book on the subject of patenting by yourself and some patent attorneys also offer kits and are willing to review your efforts. The claims are critical and this is where a patent attorney shines further but.... provided your application contains patentable subject matter and you try and write at least one claim which eventuates as unsatisfactory you may request your USPTO examiner to write a / good claim/s for you which they would accept - they are bound to do so.
The bottom line for a valid and effective patent includes that it requires an 'enabling specification with sufficient information such that a Person Having Ordinary Skills In The Art (PHOSITA) of the invention must be able to understand it or reproduce it without any further inventing although they may experiment with dimensions or materials which should preferably not be exactly specified although if nescessary one may generally safely mention a range of dimensions / quantities or the properties of materials. The specification needs to describe and the claims need to identify a sufficiently substantial clever, new, different or inventive step, having industrial applicability and not obvious to those skilled in the field or anyone else for that matter.
If you only lodge in the US, once your Specification is published you will generally lose any patent rights in any other patenting country - approximately 142 - some countries - approximately 40 - have Grace Periods - but not all Grace periods have been created equel - both in regulation and time - even if you are able to take advantage of them.
I wish you every success.
Stuart Fox - Inventor