Yeast starter

[samuelcollins]

I am using Whitbread Ale - 1099 in a higher gravity brew i am going to do in the near future.
90-Minute IPA clone
(Dogfish Head)
(5 gallons/19 L, all-grain)
OG = 1.088 FG = 1.021
IBU = 90 SRM = 13 ABV = 8.7%
It was pointed out earlier to me to make sure I pitch enough yeast for that gravity. Should I use 2 100 B cell packs with a starter? I've seen the yeast calculator but I'm having trouble figuring it out.

 

[CBMbrewer]

http://www.mrmalty.com/
http://yeastcalc.com/

 

[samuelcollins]

I've got the mr malty app, but I'm still having trouble figuring it out.
Let me be specific, I am getting in the calc that I need 314 billion yeast cells. With a starter, it appears to get that number I would need 2 packs in 3.58 liters. I am assuming this would be 2 packs of 100 billion Wyeast in a DME solution. I've never ever done a yeast starter before, always just threw the stuff in. I realize now this won't cut it. Any thoughts for a noob here?