Look, just like ITALKI has already explained to us during our registration as professional or informal tutors, if you are an informal tutor, then you should simply speak with your students about so many topics and correct them whenever they make mistakes and maybe give some kind of advice how they can improve their conversation in English.
For example, whenever I take classes with my Italian informal tutor, I simply expect he's going to correct me, to tell me maybe some phrases that are used in his region, to explain me my mistakes, etc
I hope this helps.