2013 Tacoma after market Radio install Question

i recently bought a Dual DM620 Stereo i want to use in my 2013 Tacoma , the deciding factors for this radio was the fact that it has build in navigation and also supports backup camera function .
having installed after market stereos before i expected for this to be a easy task however after pulling out the factory radio i see a bunch of connectors so here are my questions :

1.) which connectors are used for the speakers and power ? does anyone have a pinout and color scheme for the wires ?
2.) are there any problems with leaving the unused connectors open ? i am aware that some of them are for functions i wont be using with the new radio ( steering wheel controls , USB and AUX connector but i just want to make sure !

any help is appreciated