I'm an airplane guy... with a lot of technical experience. So quads ( or any multicopter ) aren't my specialty by any means and I have no direct experience with them. I do know electronics well enough that I don't find the info about their setup confusing at all... I'm just not that familiar with it. So if/when anyone else comes in and says something, assume they know stuff I don't just because I don't have that type of experience... With that out of the way.
I was always of the understanding that SBUS/PPM were what most Futaba and similar receivers are likely to use.... and DSMx was Spectrum. I don't know of any Spectrum DSMx that uses a SBUS/PPM port... so that sound wrong to me but again, perhaps there are situations that it is ok that way. So look for guidance from the others here and other places on that specific subject.
I will also mention, that from what little I've seen, the DSMx receivers often use 3.3v for power and SBUS/PPM typically uses 5.0v. Again, this could be from my lack of direct experience since I never have to deal with soldering in my receivers. So on these last two points, I'm going to refer you to the manual for your equipment since I haven't seen many of the various devices typically used in the quad market. I'd also be more concerned with the recommended voltages your receiver specifies than anything else I've mentioned. A 3.3v device may work with 5.0v for a while, but it lessen it's potential lifespan IF it doesn't burn out right away... again, it's a very important issue you need to find out about before you proceed much further.
I also looked for a manual for the included flight controller to see if that would help and there are some out there but.... A lot of companies make their own versions and all are named the Omnibus F4 ... there is the standard model and a Pro model ( also saw mention of a Nano version but not sure if it was a standard or pro ). In addition to the two models, they each have several versions that have been released. So to get correct info for the one you have you will need to know which company made it, what model it is as well as what version of that model. If that wasn't enough to complicate things for you ( being new to this stuff )... they also will have various firmware versions to also consider. The firmware is just the software it is running but what features each has will differ so will make some slight differences among them.
Oh.... and just to teach one last thing that is only sort of related that you should remember ( but even the FAA and many others get wrong )..... A "drone" is any craft ( aircraft of any type, ground, or water ) that can navigate on it's own by using programming and the sensors it's got incorporated in it ( like gyros, GPS, barometers, accelerometers and even in some cases video and/or radar etc ). A quad copter such as the one you have can be a drone... or just have basic stuff like gyros to aid in their flight but must be controlled by a person. So if it can't fly on it's own accord, it's not a drone... despite what the media, people in general or the FAA says. Just a little further, a quad can also be both, as one example most DJI branded quads can either be controlled by a person or fly on it's own and follow a programmed path and even avoid objects that in that path.