I hope your first day went alright if you had it!
I've been floating for a few months but here is my experience. In my district, I call a few days in advance to get the alarm code if it's a store I haven't been to. I usually arrive a little bit early to get the floater envelope from the store supervisor on duty. It'll contain the codes for the safe, register codes, and keys to get into the pharmacy. There is usually a notebook to sign in on and a payroll sheet where you put your hours down. It's usually attached to a clipboard somewhere.
There is usually a dr call bin with papers and the md calls in QV. I try to get most of them done before noon but if your techs are bad it's harder to do because you have to do more tech work. If it's just me and 1 tech when opening, I try to help produce and clear QT til about 9am and then start the doctor calls. I switch between the two screens (ctrl+f1 and ctrl +f2) and keep doctor calls on one and qv on the other. I also try to help with QT which depends how competent the techs are. Some techs are really good and you don't have to worry about it much. In the morning on the week days, I don't really worry about PCQ calls. I do them in the evenings. My goal for every day is to try not to have any queues go red. I get anxiety when I'm only a half hour ahead though. If closing, I at least finish everything for that day if I can't clear the queue.
As far as paperwork, some techs know where it goes and some don't. Most do not, so I leave it out for the store pharmacist. If you work a full day, make sure to print and sign the daily register log at the end of the day. Also at each store, I have had to find the floater envelopes but they are usually in a drawer somewhere.
Also, at some point there will be some PIC who is an a-hole who will try to get you in trouble even though you are doing the best you can with the resources available because you let something go red and it might lower their wecare score.