Jeep Cherokee Forum - Need help 2006 grand Cherokee starting issues

Hi guys, new to the site & new to owning a jeep so please bear with me. Over the last few months I've had electronic issues like dash warnings all coming on then going off, engine on & code saying I have a cylinder not firing but it's working fine, tire pressure warning on rear tires went out but next day was fine. My issue now is it won't start, first I had to turn the key a few times before it would run ( starter wasn't clicking ) then a day ago it would start for a few seconds then stall but after a few tries it ran fine. Today it won't start at all & I have no clue what to do & money is tight for a few weeks. Need this for work, any advice would be much appreciated. Thank you