Module-pool

Hi

Iam new to module pool and please help me on this.

I have 5 screens and i guess every screen will be having pbo and pai.

in pbo iam selecting fields from table and storing in in ternal table..

i need to pass that to respective fields on screen...How can we do?

where do we write cursor syntax??

what are screen elements?

Is it the best way to see screens in se80 and write code there?

Any example will be highly appreciated.

Thanks in advance