RF PCB design

Hello,

I am doing my first RF project. i want the help regrading trace width calculations.  I have to design 6 Layer PCB in FR 4 material which my first layer contains RF signals.

My layer stack up is like Signal, GND , Inner layer, Power , GND, Bottom.

I have query regarding the RF PCB design.

1)  RF signal contains in 1st layer so which calculator used? co planner or Micro strip?
2)  How RF Trace length important? any calculator for RF length calculation? 

Please guide me as soon as possible as this is my first project and i have to submit it.

Thank you so much.