For the first one, you gotta be on Maya's path and after shot battle with Derek, you'll need to go back to Maya (bad decision imo but whatever

)
2nd one is tricky, at Ep 3's end you need to go to Derek. There you'll have an option to pay an extra visit to the Pink Rose, you'll meet Rose there and it'll happen. She has a requirement to be a freebie or you need to pay $$$ or $$$$, don't remember how much exactly.
For the rewards, there's no way to know where is each, I suggest using the walkthrough guide or something