Help please!!
#2
start by cleaning and looking over the battery cables. next check all the fuses in the fuse box by the driver door and the box under the hood. do u have a extra ignition key? if so try it and see if that one will work. if it does the chip on the one key is bad.
#4
thats probly the solonoid or maybe a bad connection at the starter wire also check the tightness of the bolts that hold the starter on. thats how the starter gets its ground. expect it to have problems some time in the future.