How do you people keep your string from getting a bunch of knots in it when you do binders? (and yes im doing them from a trapeze)
Check your string tension.
I couldn’t help but chuckle at your use of the word “Bind” either haha.
Try doing back spin binds. Check out youtube for a variety of bind tutorials.
Yeah. YouTube is your best key!!! You’ll be doing binders in no time! 
Use fake binds. Search them up on youtube.
I too had this issue. The only bind i can successfully do every time is the frontside one. You need to make sure you feed the loop in as much as possible, or else it will catch too soon and cause that twisted loop to stick out from the yoyo.
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Flip the yoyo around and land it on the other side of the string, then bind.