CONFUSED AND DONT KNOW WHAT TO DO

HEY EVERYONE.. MY NAME IS THERESA.. IM A 25 YEAR OLD CHIC AND IM HAVIN SOME MAJOR ISSUES. I BOUGHT A 98 FORD CONTOUR SE 6CYLINDER 2.5L CAR FROM MY GRANDPA... I TOOK IT TO GET EMISSIONS DONE WHICH I HAVE NEVER OWNED A CAR NEW ENOUGH TO GET THAT DONE.. AND 7 DIFF. CODES CAME UP. I DONT KNOW WHAT THEY MEAN OR EVEN HOW TO FIX THEM. IF ANYONE HAS ANY IDEAS OR THOUGHTS PLEASEEEEEEEE HELP... THE CODES ARE

P0171
P0174
P0401
P0420
P1100
P1157


I DONT KNOW HOW TO GET MY CAR LEGAL WITHOUT EMISSIONS.. WHAT DO I DO? PLEASE AND THANK U