Squareneck resonator is an easy instrument to make sound BAD! Believe me I know. Grab Troy's lesson called Dobro for the complete beginner. It will teach you some basic stuff that you NEED to know like correct way to hold the bar.
By the time you finish this lesson you'll be able to get good sounds from the dobro and go from there.
I did this one first
https://www.lessonswithtroy.com/Dobr...-Beginner.html
Then went through the DOBRO Basics series. Been playing about 4 1/2 years now. It's a slow but enjoyable process. I've learned to measure my progress by seasons, not weeks or months.