How can I improve my nasally singing voice?

I just started taking singing seriously as of very recently, and I’ve noticed my main issues are my VERY loud breaths, and a very nasally sound that I don’t even notice when I’m actively singing, only in recordings. I think that it may have something to do with lots of clenching and tension in my throat, but I’m not certain if that’s the cause. How can I breathe quieter, and open up my throat and nose? I also eventually want to take on a more rock n’ roll style of singing, so I’d love to hear of any other improvements I could start working towards in regards to that. Any and all feedback helps!