Trying to figure out what rules to use for campaign

Hi all,<div><br /></div><div>I last played Star Frontiers about 35 years ago.</div><div><br /></div><div>I am looking to use Fantasy Grounds for which I have the ultimate license (no purchase required for players).</div><div><br /></div><div>I have the Star Frontiers basic and expanded rules (as they came in the box), Zebulon's Guide, a document I dowloaded some years ago called &quot;Star Frontiers 2000&quot;, and a number of modules i have bought now and then in the last few years.</div><div><br /></div><div>I cannot figure out what rules to use.  There seems to be a lot of revisions.  Some look really interesting.</div><div><br /></div><div>I am concerned with so many rule revisions out there.  It seems messy to have so many books some of which might or might not work together.</div><div><br /></div><div>I would be grateful for any pointers.</div><div><br /></div><div>Thanks,</div><div><br /></div><div>Kevin</div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div> </div>