Hi Sanjay,
I'd recommend that you make yourself familiar with the different option of value and search helps offered by FPM first. All details are described by the FPM cookbook that is linked within all MDG related enhancment guides.
Then you should consider existing MDG enhancement guides since those usually contain examples that might not fit 100% to your use case, but could be easily adapted.
Finally you can of course always take a look at the standard MDG implementations. Those contain many examples for value and search helps.
Best regards
Michael