In my opinion, the best way to get familiar with the language is to increase your exposure to it. Books and podcasts could be a great help. Also, practice speaking daily. Maybe for twenty minutes. And if you have any issues, feel free to drop a message. I would be happy to help.

Find a suitable teacher, watch YouTube courses, practice with friends

I'd say start with a quick refresher and see what you need to work on, then work on those things. Of course, having a good teacher helps :)