When to apply for internships?

Hey, I was wondering when to do internships for ECE core? I'm planning for higher studies. I just finished my second year and I'm on vacation. I was thinking of doing internships once college starts, on weekends, or after my fifth semester. Or should I try now? I was thinking maybe I'll do some projects now and enjoy this vacation, then do an internship later?and how to apply for?

(I'm from srm ktr)