I already have a BA in Communications, and I want to further my education to become an ESL teacher. What is the best path to take?

I am on the exact same path as you at the moment - I am doing my City and Guilds 7407 cert in FE leading on to my Cert Ed, but I have been advised to complete a CELTA course during my training/studying as this gives me an additional qualification (required) to teach ESOL in the UK and anywhere in the world.
Hope I could help.

A lot of places ask for CELTA as required qualification but it depends where and how you want to teach. Investigate this end first and while searching you'll see the requirements for your path in life.