Once you're done in the beginner camp just go to a brotherhood bunker and recruit more squadmates. I'd really recommend finishing up to atleast Macomb in the brotherhood campaign before wandering off into the new content. There are alot of tough fights, but lots you can avoid and still explore.
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Just another OG Fallout fan. Currently working on a walkthrough/guide for Xkcon's Ultimate Ripoff Mod for Fallout Tactics: Brother Hood of Steel. Might do some other ones eventually, who knows.