cargo van project for a rookie

hi guys, i am new to this site so please be kind hoping that some of u guys can help.. first of all i just wanted to say that im from dublin ireland and i cant find any installers that are capable of doing what i would like... i have a cargo van which i am coverting the cargo compartment into an entertainment lounge...thats all i know at the moment...lol. i am looking for some guidance as to how i can install a 32" lcd tv, dvd player, basic sound system and a computer so that it runs off a second battery... also i dont know if i need to covert 12dc to 240ac as all the devices are made for 240ac power supply... any help would be greatly appreciated...suggestions also welcomed. thanks charlie21

guys i should also mention that the link i have provided is for the vehicle that i have. the alternator produces 150 amps and the van is new!    http://www.nissan.ie/vehicles/commercial/primastar/specificationsL1H1.asp?displayAll#topOfPage