Depending on what Futaba radio you have will determine if you can use it for helicopters.

If you are serious about wanting to fly RC helis...I recommend that you skip the co-axial and possibly the FP (fixed pitch) helis all together.  While a FP can lend you a hand in learning to fly a somewhat unstable heli...a FP is way more stable than a CP (collective pitch).

If you really want to take the hobby serious...just go straight to a 6 channel (again, this is where your radio may not be up to the task).  With the newere micro CP helis on the market, the Blade mCPX to name just one...paired with a decent flight simulator will get you where you need to be.  Having someone that is already a heli flyer will be even better, as they will be able to show you all of the ins and outs and save you some money and time on getting your skills.

So...to go it on the "cheap" to see if heli flying is for you or not.  I would go with a Blade mCPX RTF model (Ready To Fly) as it comes with a radio and is pretty much ready to go out of the box without needing to know a lot about setup.  Also, at the same time buy a Spektrum/JR sim cable as well as a SIM (I use clear view...but Real Flight and Phoenix are very good too...just a lot more money).

Once you can fly on the SIM...get the real thing out and go for it.  This will let you know if heli flying is "your cup of tea" or not (sorry, no pun intended LOL).

Goodluck!