Newbie: Overall questions

It doesn't seem like there is a way to edit a campaign without launching it, is this true? Also, once I send out invites for a game starting this weekend, it would appear they can view the game right away. How can I invite players but not allow them to view the maps ahead of time?

Cover the map in Fog Of War??

Create a blank map page and move the Player tag to that. So when they log in, they won't already be at your game map.

I use what I call a blurb page. It has the title of the campaign, what time and day the game is played on, a short summary of the game overall, and a space for the player's mini's. I leave the player's ribbon on that page unless the game is in play. This allows me to post on the sheet such as updates, or cancellations  or even additions to the game without having to contact each and everyone. You can use it to list the xp for everyone's characters also. A lot of people do what Brett and Kristin say.