Need advice/help on fitness 30f?

Hello! I just turned 30, I gained a lot of weight going through depression after unexpectedly loosing my mom. I ate whatever I felt comforting and put on around 45-50lbs. I’m ready to put my best foot forward and put in the effort to getting healthy and losing the weight I put on. However I have no idea where to start or what gym routine to follow, if anyone has helpful advice, maybe YouTubers or apps that I could follow to help me on my journey that would be amazing, thanks :)