2000 Neon Fuse Problem

allright so i just picked up my 2000 neon today, and there was no deck (previous owner had aftermarket)
so i decide to stick in my old pioneer cd deck

i baught the adapter kit and all the wiring adapter, so at first i connect the wires color coded to test if i had them hooked up right
i turn on to "accecories" and the deck turns on i put in a disc and pump it
and also realise that my driver door speaker is blown

so neways i take key out of ignition disconnect the wires and connect them with proper wire connectors and all that... then i test again.....deck wont turn on

well i decide i messed up somewhere so meh i had to leave for work so i disconnected everything and left it

then when i started engine to leave i noticed i get a "fuse" message in the dash and also my lights (tail and signals) go into "hazard" mode so they all flash when i signal left or right

so im guessin i blew a fuse but the question is where do i start?

also i had to replace tail light bulb earlier that day cause it was burnt but after that it worked fine...

aany help appreciated tnx

guys plz help