Italic letterforms (sans serif)...

Greetings, I was generating an italic sans serif with a 15-degree deviation from the regular axis. 
To what extent do italic letter forms differ from standard axis letter forms? (Please recommend videos, blogs, or literature)
Could you kindly provide a step-by-step explanation of the process? 
How should the caret offset be computed? Is a formula applicable to that? 
Can spacing and kerning of plain axial characters be replicated via copy-paste?

Thank you.