Help with building a custom recovery from scratch for the first time topic

i wanna build a custom recovery for my zeki tablet can someone point me in the best direction to start?

Slim tpu case that does not scratch the metal chamfered edges topic

I just recently purchased the Note 4 and am awaiting delivery of my new phone. I was checking online to purchase a case before my phone arrives but almost all cases seem to have negative reviews citing scratches on the metal edges from the case.
Can anyone please recommend a good thin tpu case ( I'd prefer a tpu case so that it does not slip when placed on the treadmill sideways) that does not scratch the phone.
Thanks for your help!