Travel Distance Calculator

Hello Everyone.
I am given a task by my client to develop a calculator which will calculate the Cab fair from one location to another.
There is a list of Cab fairs as well as their corresponding Location Name.

It would be displaying the results on the screen.

User will select the Location one as Source Destination.
User then will choose the Final Target destination to go.
Use can choose some factors like Baby Seat chosen by a radio button , this will contribute to the final calculation of the rate.

Hit Calculate and The form will display the Resulting Fair amount in Pounds Currancy.

Can anyone guide me on how can i approach this Project ?

Please advise since i am a newbie in the action script.

Any Help would be highly appreciated.

Best regards

Umer