The easiest thing to do is to subscribe to some of the magazines that put info like that in their issues. I have used "The Huntin' Fool" and "Eastmans Hunting Journal" in the past, but I'm sure there are others. The thing that I've learned is that individual units can change quickly. Things like tough winters, increased tag numbers, etc. can make things tough. But, the state of Wyoming, in general, is absolutely full of antelope. I've read that there are more antelope in the state of Wyoming than the rest of the North American population.
I would start with the game and fish website: % success, changes in tag numbers over the last couple years, points required, etc. Eastmans Hunting Journal really spells all of this out in their members research supplement - this (I believe) is also available on their website to look up past advice - just because someone says a unit or an area is hot now, I think it is good to look back over several years to see if the unit or area typically produces what you're after.
Once you zero in on a unit or area - get the blm maps. This will show you land ownership and road locations for the most part. Roads on BLM land can and do change and maps are not updated every year.
Once you've got all of that down, get the best spotting scope you can afford and be ready to look over a lot of bucks before you find what you want. Patience and good glass can lead to a diy book head, but it takes a lot of patience and skill at judging what you're looking at.
I hope that helps!