If you want to get started in web dev, you need only study and practice, and both of them are free. I recommend starting right here at http://learn.freecodecamp.org and if you have any questions about the course, feel free to come on back here and ask. Welcome to freeCodeCamp
Welcome to the forum, like chuck said its best to start with the curriculum on freecodecamp. It gives you a pretty good starting point for web dev.
P.S. I am in a similar boat myself, mechanical engineer switching over to CS in the states. I’v been teaching myself webdev and python for about a year now. I’m considering going back to graduate school to get a masters in CS right now lol. Let me know if you ever want to chat.