>>2777760OP here. Shits easy.
Taco seasoned ground beef or turkey.
Refried beans from a can.
Melted salsa con queso dip.
Squirt bottle sour cream (easier to apply evenly and doesn't dirty silverware).
Fresh cut jalapenos and green onions.
Sliced olives from a can.
Pile that shit on top of some tortilla chips and that's it. You can't really go wrong throwing on whatever Mexican ingredients, but you need the basics of meat, beans, and cheese.