Start by listening/understanding.

When I started learning English for the first time 58 years ago at P.5, my teacher began by saying "Good morning" and he used gestures to make us repeat after him "Good morning".

Then he started introducing many things in the room, saying "This is a book (pen, window, chair) and gestured students to repeat after him.

The next day was the same but he began to say things while writing corresponding words on the blackboard so that we could link words with sound/meaning.

If you could remember something like this, you should get some ideas how to advance your conversations, simply it is about accumulation of words/meanings and speaking them out as often as you can.