Welcome to RG and a new experience of EQ that will be an excellent journey! Patience will be your friend here for sure as it takes time to understand how to set everything up and control your crew. The videos Sic created are the best resource for you. Try taking a few toons (even new ones) to an unpopulated zone and test there. I know I found it hard to take my focus off the toons I had prior to joining RG and make them dance like Sic shows in those videos but once I put that aside and made my focus on learning how these tools worked, it all came together.
Starting with one or two toons plus your driver to get your feet wet can be simpler for sure. Once you have RG installed and loading, get them added to mq2autologin and loading up. Once you're comfortable there, group them up in game and try some simple commands like the come to me, follow me, etc and maybe use some of the dannet commands to make them wave. If you get them all doing what you expect, then it's time to look into your desired automation so you can put the team to work.
Check out
Kissassist Beginners Guide,
Kissassist Commands ,
RGmercs, and especially
cwtn plugins ( you can also /testcopy your toons and use the
cwtn plugins there for free and you'll want to spend some time looking at
CWTN Plugins Explained.).
New as of Feb 2024, RG Mercs Lua Version
The KA library has some ini's folks here have created and shared but they often require some editing to make them work for your toon/team. This is not overly difficult to learn and will require some more learning about how they work from the KA Commands page. RG Mercs and the cwtn/sic plugins are pretty much plug-n-play. RGMercs is included in your level 2 sub whereas the cwtn/sic plugins have an annual cost of $20 per plugin (not per toon).
After you get the hang of it, I would recommend adding the remaining ones as early as you're comfortable so they advance together. 6 (plus) is where almost everyone ends up. Pick a tank, then a preffered healer and some cc, and 3 dps classes you like and you will be off and running with a new crew!!! If you get hung up, make sure to seach these forums (top right corner)

for answrers as it's likely someone ran into the same issue as you. If not, ask away here under the correct forum/thread and this amazing community will always offer a hand!