A guide might seem unnecessary now, but your alpha testers are much more likely to have the right thinking style to pick up these things quickly, and they are also much more likely to hunt through forums, game guides, etc. to find answers. But if you are hoping to appeal to a large target audience, they are going to need some extra help finding the answers to these questions. Also, having an official game guide will be better than a Wiki or other type of unofficial guide because those become inaccurate quickly in a game with constant changes being made. Below I will try to make a list of things that would be helpful in a guide.
Bot damage per second at each range
Bot time between shots
Bot damage per shot
Detailed description of each possible
Target Type option
Target Selection option
Target Filter option
How the targeting system works (sort of included in previous list item, but bears repeating)
How multiplayer scoring works
What multiplayer leagues there are and what point ranges they are
How you unlock more bots
What changes with a bot's abilities if it picks up a resource
How walls work
Tips for certain AI routines
Picture of each map
AIs to practice against
If something like this exists, please point me to it.
If something pretty much like this exists but is unofficial, please point me to it.
If you have any ideas you would like to add to my list, please do!