I was recently contracted to shoot my first wedding this coming December, and I know lighting group shots and receptions can be tricky for total noobs. As I am about to expand my lighting kit significantly, I had one main question:
If you had to rebuild your light kit from scratch for event/wedding and group portraiture work, what would you buy? The GODOX system to start off with?
To answer the final question first, I would build on the Elinchrom Ranger if I were going from the ground up. Having 1000+ WS is in the sweet spot for competing with the sun when you need it, is plenty of power for large modifiers and spreading light over a very large group or at a distance, works well for high-speed sports, does well in inclement weather and, if you have an excess of power, the light is instantly ready for the next shot.
Does everyone need this? Absolutely not. Can you do great work with Godox? Absolutely. I own both and you can't tell from the photos which I (used unless there is something extreme which reveals a lot of power was needed, anyway).
As for the question which is raised by your post but isn't asked...I suggest you think carefully about taking on a wedding without the experience.
Weddings are a serious challenge and require a broad range of skills. And you need to have those skills down so you can execute quickly and correctly. You can't hold up the wedding reception because you are fiddling with lights. You need to be able to produce images in the conditions you are given (church interior, reception, etc). There are images you will be expected to nail (first dance, cake, toast, first kiss, etc, etc). And there are the complex social situations you will need to float through smoothly while creating images.
At the very least, I suggest you get a second shooter with experience who can work it with you to reduce the chance of disappointment.
I strongly suggest having a contract and having appropriate insurance which covers wedding photography.
In general, I encourage photographers to just get out there and do it. Weddings would be a notable exception.
You don't get a "do over" with a wedding. The wedding day is about the bride and groom and their celebration, not about the photographer.