I'm MSc. student. I'm writing my thesis using Latex, and I'm a newbie with LaTex. I need some help in LaTex, please it is urgent.

I've some concerns:
1. Regarding margins, I need the whole pages including the title page to be: left margin: 3.5 cm, upper one: 2.5 cm, the rest 2.5 cm. I've a problem in the first page of each chapter; it gives more margins on the top of the page before writing Chapter 1, Chapter 2, etc.
2. I need to put the chapter headings (eg. Chapter 1, Chapter 2, etc) centered.
3. I need to use (Times new roman) font: with 14 plain headings and 12 the rest of the document. It gives me bold headings, sections and subsections. I need them to be plain text.
4. I need to put the journal and publisher in Bibliography in 'bold' and the rest of the reference plain 12 times new roman one. I'm using \bibliographystyle{apa}.
I'm using (\documentclass[a4paper,12pt,oneside,openright]{book}.
Thanks in advance.
Regards,