If my friend is being charged with a forged instument class d felony and attempt poss of forged insrtument class e, will he go to jail?

This depends on the facts of the case and his prior record. Without knowing more I can't tell.

Instead of worrying about the jail time, you need to focus your attention on how you can avoid being convicted. Forgery is a crime of moral turpitude, and if convicted you can kiss your career aspirations goodbye. Hire a lawyer before you get duped into a plea you will regret for life.