CFI

Before you pursue your CFI rating make sure you’ve met these requirements

Have logged at least 250 hours (or 190 hours Part 141) total time.
Hold a Commercial Pilot Certificate or ATP (ASEL or AMEL) with Instrument Rating.
Hold a valid FAA 3rd Class Medical Certificate (or higher).

If you’re pursuing a CFI Sport these are the requirements

100 hours of flight time as PIC of a powered aircraft
50 hours of flight time in airplane category
25 hours of cross-country flight time
10 hours of cross-country flight time in airplane category
15 hours of flight time as PIC in airplane category that is Light-Sport aircraft