Filing married - foreign non-resident spouse

Hello,

 

Similar questions have been asked but I am asking for the details of my situation and for the current tax return year. I would like advice about how to file my taxes this year. I am married but my wife does not have citizenship or a green card yet. She lives in Mexico and has applied for a greencard and is waiting to get an interview. She currently doesn't make any income and hasn't made any income that would be taxed in the U.S this year or previously.

My question is how should I file and any things I should know when completing my return. I read in similar posts that it is recommended to file married but separately and mail in the completed forms instead of e-filing. I'm wondering what options there are and what would be recommended. Thank you kindly for your help.