Exposing ABAP program in net weaver gateway as a service

Hi,

I'm a beginner and new to gateway, I was trying out some stuff.....

I have written an ABAP code which accepts two numbers and computes the addition of those two numbers at runtime and wanted to expose it as a service in gateway.

I read through some stuff, It said I have to remote enable my function module and then implement it using the consumption module.....could anyone please guide me through this.