GA SMA INSTRUCTED TO HOLD FOR RELEASE TOOK OFF FROM NON TWR ARPT WITHOUT CLRNC.

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THIS INCIDENT CONCERNS THE MISUNDERSTANDING AND NOT FOLLOWING INSTRUCTIONS AS GIVEN BY ATC. FOR THE RETURN TRIP I WALKED TO THE FSS ON THE FIELD AND FILED A NEW FLT PLAN FROM SBY TO MFV (45 NM). THE FSS SPECIALIST ADVISED ME THAT CONDITIONS WERE OBVIOUSLY VFR (6000-7000'/15 MI) AND TO CONTACT PAX RIVER CLRNC DELIVERY TO PICK UP MY CLRNC. THIS I DID WHILE TAXIING TO THE ACTIVE RWY. CLRNC DELIVERY READ MY CLRNC AND INSTRUCTED 'HOLD FOR RELEASE.' HEREIN IS THE PROB. I HAVE JUST RECEIVED MY IFR RATING AND THIS IS ONLY THE SECOND TIME I HAVE FILED IFR (W/O THE INSTR). I HAVE BEEN TAKING SUCH FLTS AS THIS TO LEARN THE SYS AND BE A BETTER PLT. AT ANY RATE; MY UNDERSTANDING (IGNORANCE) OF 'HOLD FOR RELEASE' MEANS THAT IN AN UNCTLED ENVIRONMENT (SBY HAS JUST THE FSS); I COULD TKOF (VFR) AND GET MY RELEASE IN THE AIR. THIS IS WHAT I DID. WHEN I CALLED APCH FOR MY RELEASE; HE WANTED TO KNOW WHO HAD GIVEN ME THE RELEASE. I SAID THAT I THOUGHT IT SHOULD COME FROM HIM. HE SAID I SHOULD HAVE PICKED IT UP ON THE GND. THEN HE GAVE ME MY CLRNC AND RELEASE TO MFV AS FILED. I NOW KNOW WHEN THEY SAY 'HOLD FOR RELEASE' IT MEANS TO HOLD ON THE GND AND WAIT. BEING IN AN UNCTLED/VFR ENVIRONMENT IS NO LICENSE TO TKOF WHEN INSTRUCTED TO HOLD. HOWEVER; SINCE AT MY HOME ARPT YOU MUST BE AIRBORNE IN ORDER TO RECEIVE A RADIO SIGNAL I THOUGHT THE SAME WAS TRUE HERE. CONCLUSION: THE APCH PLATES SHOULD MAKE IT PLAIN WHO TO CONTACT AND WHEN. I MADE A MISTAKE AND LEARNED A LESSON. TO LEARN THE ATC SYS WAS THE ORIGINAL INTENT OF SUCH FLTS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: RPTR NOW UNDERSTANDS THE DIFFERENCE BTWN OPERATION VFR AND IFR AND KNOWS CANNOT DEPART IFR W/O RELEASE EVEN THOUGH HAS RECEIVED CLRNC.