Lync and Phone number questions

I'm trying to figure out what my limitations are and what's possible as I can't find a way to setup what I'm looking for. I have some users o the E3 plan and some on the E1/E2 plan.

1) Have a conference room where Lync provides a dial in number to everyone to dial into

2) Have Lync dial a phone number

3) Have someone call some type of "Lync" number so that it goes to your PC (while you're signed into Lync) or an exchange voicemail 

4) Do I need a dedicated conference phone number services to supplement my Lync meetings if people in the meeting are not on Lync and need to dial in? This I guess goes with #1

Thanks