Taking classes is a primary essential step either online or through life tutoring .
Besides you will need to practice what you learnt there and there are several methods :
- Reading books that suits your level .
- Watching movies , listening to music.
- Speaking english with people .
As for online conversations that would be possible on any chat program to speak with english natives or just english speakers,italki as an example .
Here some online sites that could help you with your conversational english :
I hope this would help you somehow :)