The most important thing you need is a cheap pair of amplified PC speakers. I paid $10 for a pair of "Kinyo" ? speakers and detached the power/input/output wires. The amplifier is an AC powered 6 watt stereo amplifier.
Some items you need. Wire strippers ( the automatic kind to the lower right are fantastic !) various crimps/marrettes . binding posts, bananna plugs, wire snips,a drill and various drill bits. Dremel multitool/bits. Third hand is very useful.