Want to add Ballast for tige 20v
 

I bought a Tige' 20v with low hours. I want to add ballast and would like some help and ideas deciding how to do this correctly. I don't know how many bags to buy and the best placement. How much in the back, middle or front? Thank you in advance for your help!

If you go over to Tigeowners.com i'm sure there's already a thread on how to weight that boat.