Design of Three coupled tune circuit as bandpass.

Dear all, Please i need help designing a three coupled tune circuit as a bandpass filter. Firstly i'm a novice in microwave, so please bear with me. Please is there a formula that can be use to design these things? I'm quite frantic so i don't really want to go into so much depth, as I've been told it's quite hard to design from scratch.
I'm using a FR4 board with a dielectric of 2.4, height of the board= 1.5mm, impedance of 50 Ohms. The schematic can be seen below in the attachment.

In addition, how can i find the inductance per unit length and Capacitance per unit length of each micro strip line in the diagram. P.s i've read quite a few text books and they seem too complex/confusing for me. Any suggested values will be appreciated.

Thanks for your time.

Search the net for the freeware Ansoft Designer SV (Student Version).
This will do simple microstrip filter simulations as you need.