Don't panic dude. I have experience with res fishing, you'll love it.
First thing to do is completely ignore the advice of the manager (imo). Carp go where and do what they want. They may well feed mid water on fry from time to time but that is not how you should try to catch them imo. Carp are carp, and they like food (i.e. bait), so you should start with the method you're confident in. If that doesn't work start thinking about why it's not working and change accordingly.
10000 BRs will be fine mate (assuming you can hit your spots), you'll not run out of line, they are just normal carp in a bigger water.
You will defo see them showing mate, but you might have to look harder.
Basically you should approach it like any other water. First thing is to find them, don't even bother setting up unless you've done so or the blanks will soon mount up and you'll lose your head. Once you've found them, fish for them like you would any other carp. If you get the very basics right you will catch them. Don't over-complicate it.
If over time you find they frequent certain areas, you can start pre-baiting and get good results very quickly.
Have fun.