Agree with Rafael.

Add a Futaba 6 channel S-FHSS receiver and you will have a reliable system you are already accustomed too. Do not go the Spektrum satellite Rx route as severely limited range will cause problems.

Chances are you did not get the manual nor extensions from the original owner as many sellers never think to include, or even bother to keep them.

The manual explains all hook ups and adjustments.

http://www.horizonhobby.com/pdf/BTXM76000-Manual.pdf

Not really difficult, just takes a little time.

Good luck.