If you’re a newbie, then WEIGHT IS YOUR PRIMARY NEED.
Most people progress in the opposite direction that you have gone- they start training at home with their 60lb db/bb set, (often to get themselves to a level where they feel “confident” enough to hit the gym proper), then run out of weight and go find the real stuff at the local gym.
If you’re serious about home training, then you’ve got to take it seriously. It will NOT be cheaper in the short term, and unless you live miles away from the gym, or work funny hours, will not be more convenient in regard to choice/availability of exercises. There’s also the aspect of proper form (or lack of it), lack of spotters if needed etc. (However you need to find the right gym to get these last 2 sorted)
So, take all this into account before starting out acquiring home equipment. If you’re still set on it, and are training functionally, then you’ll soon find that the need for more weight will be your most likely limitation to progress.
IMO unless money isn’t an object (and I think the way you’re asking the question, it is), then forget the “specialist isolation” equipment such as the bar you describe, that you might use say once a week, and build up your weight stack.
Hope this helps. SRS