Recommended router BIT for cutting 18mm MDF for 1/4" and 3/8" shank router

Hi I am looking for Recommended router BITs for cutting 18mm MDF for 1/4" and 3/8" shank router. I am not doing find detail work, so looking for best cut rate etc.

What do I go with - straight, upward cut, downward cut - how many spirals? etc

My apologies I am new to this and still trying to learn the strange lingo you guys speak in LOL

Thanks in anticipation