midilandq

Hi everyone, I am completely new to video surveillance cameras and electrical work in general so please bare with me. I recently bought a '8CH Channel H.264 Network Surveillance Security DVR 700TVL' and it came with wires that are much too short. I also bough a RG59 Siamese cable hoping to extend both the power and BNC. My question is, what is the best and safest way to extend the 12volt DC power? Thanks!