Mate - this is a kernel thread and I shouldn't have even answered that here. I didn't realise how long out of it you seem to be.
Check out the thread on installing twrp & magisk on OOS/beta and read the directions..
Older posts may say blu_spark twrp isn't working with Q, but it sure is now. Pls ask it all there after you read to save cluttering up his kernel thread with all this. Thanks & good luck. You'll get there again.