Passing parameters to BDC FM

Dear gurus

I am a fresher,i have to create a bdc in function module with import parameter as field.

i have declare all fields that i want in import parameter,

Now, in source code - How should i proceed further to complete the FM for BDC.

I would like to add that i have design a create Button through which this BDC FM will be called.

I have internal table having values .

how to do this ...please help

Thanks

Regards

Arun