New to Multisite - clone main site

I am converting a single site into a multisite. I have already enabled multisite, and everything seems to be working. I believe the original site is now the main site. I want to move the main site to a template site (or clone). Then from the template site I want to make some adjustments, like removing users, basic editing. Then once the site is ready I want to clone that template site out to 3 new sites (multisites). From what I have been reading, copying the main site can cause problems. I see there are some tools to accomplish this, but they all have warnings. I am looking for guidance on how to accomplish this. The main site does use Buddy Press and bbPress.