CORP PLT FAILS SET UP NAVAID; APCH WRONG ARPT; PENETRATES RESTRICTED AREA.

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I WAS ON BWI APCH CTL LOOKING FOR MARTIN STATE ARPT FROM THE N. I WAS VERY BUSY IN THE COCKPIT TRYING TO FIND THE CHARTS; FREQS; ETC. SINGLE PLT OP. I HAD A WAC CHART OUT LOOKING FOR GND REFS AND WAS ABOUT TO SET THE LOC FREQ IN WHEN ATC CALLED. NEVER GOT IT SET UP. I LOOKED OUT L AND CALLED THE ARPT IN SIGHT. APCH CLRED US FOR THE VISUAL AND TOLD US TO CONTACT MARTIN TWR. I SET UP ON A R BASE AND CALLED THE TWR. HE TOLD US TO RPT THE L DOWNWIND FOR 14 (SHOULD HAVE BEEN MY FIRST CLUE). I INFORMED HIM WE WERE ON A R BASE AND HE ASKED OUR POS. I SAID 6 W. AS I APCHED THE STRIP I KNEW I HAD MADE A MISTAKE AND STARTED TO TURN BACK. MARTIN TWR CALLED AND SAID APCH CALLED AND SAID WE WERE SET UP FOR WEIDE AAF. THE TWR INSTRUCTED US TO TURN L TO 360 DEG AND CLB TO 3000; THEN TO RECONTACT APCH CTL. CALLED THEM; THEY TURNED US FURTHER L TO 270 DEG AND STOPPED THE CLB AT 1500. WE FLEW OVER TO 1 MORE PENINSULA; FOUND THE ARPT WITH NO PROBLEM. LANDED WITHOUT INCIDENT. NO ONE SAID ANYTHING ABOUT ANY PROBLEM. HOWEVER; ON MY OWN CHKING I REALIZED I HAD ENTERED RESTR AREA R-4001A. WE WERE THERE FOR A VERY SHORT TIME BUT NONETHELESS; I WAS IN IT. THE SMT IS AN EASY AIRPLANE TO FLY BUT AS A SINGLE PLT OP IN THE NE CORRIDOR; IT GETS HECTIC. FIRST; FLY THE AIRPLANE. SECOND; SLOW DOWN AND CONCENTRATE. USE EVERY AVAILABLE NAVAID AND MAKE IT A POINT TO GET THEM SET UP; NO MATTER HOW BUSY IT IS. BE AWARE OF THE SURROUNDING AIRSPACE. BE THANKFUL FOR THE ATTENTIVE CTLRS.