For all your pronunciation questions, I’d recommend checking out Dogen. He has a few free phonetics videos on youtube and the rest of them are available to buy on his Patreon. They’re really well made and really useful.
Also, in lesson #43 he says じ is pronounced as dʑ at the beginning of a word, and can often become ʑ after a vowel. (He also has more information on this in the video.) I believe he said じ and ぢ once had differences in pronunciation but in modern Japanese do not.
In another lesson, he also covers how to pronounce あい if you want to check that out!