this is for Spanish

when do I use the pretérito indicativo vs imperfecto indicativo vs condicional indicativo and the difference between imperativo and subjuntivo

I am looking for someone who speaks Spanish and wants to get better with their English. We can speak in English for 30 minutes and we can speak Spanish for 30 minutes once or twice a week. This would be on Skype. I would like to have conversations about different topics each day to expand my vocabulary. I can also teach you slang. And I would like to learn some slang as well. I want to learn slang from Mexico if possible but it’s ok if you speak Just speak Spanish. I also want you to correct my pronunciation. And I want to sound natural so feel free to correct me.