Your questions are normal for a newbie. When I first started cleaning, I took way too long to do everything, which is also normal. Over time I became proficient at getting more done in less time. Part of it is learning what products work best for you, and what tools. A couple for me were buying a divided bucket, so I could put clean rages in one side and dirty ones on the other. I found the best vacuum cleaner for me -lightweight but strong, and both have LED headlights. I started at first using ordinary sponges, but found that another type worked better for me. I slowly left using "chemicals" and went to plant based products. So much of residential cleaning is figuring out what "pattern" you should use in every house. It isn't always the same, too. Do you start in the bedrooms and work out?? If the house has an "open" floor plan, that (at least for me) makes it a bit harder to figure out what and where to start. After I clean a house several times the best pattern usually jumps out at me.
I pick up quite a bit of new customers who had used "cleaning companies" and weren't pleased. The first time I clean that home I know why. No high dusting, string mops on tile floors, in general cleaning not up to par. I have no employees and don't want any, just because of this.