I hate to be one of those people, but…
Unless you have a Manfrotto Carbon Fiber tripod with ball head, even at FULL RETAIL the whole kit-n-kaboodle mentioned above would yield around $1050 Canadian.
With all due respect, be realistic.
To a pro or even an enthusiast, those items holds very little value. Anyone shooting for more than a few years has already upgraded beyond what you have. If the sales folk at the store you mentioned said you could get a G note for everything if you sold it privately, tell them to put the money where there mouth is and sell it for you.
My dad always said “a salesman is a salesman first and a person second,” and I’ve found they’ll tell you anything to make a sale, even things like “your old stuff? I shouldn’t be telling you this but…”