Tell your agent about anything non-negotiable early, a specific school catchment, no major road exposure, a legal secondary suite for income, so your first showings are actual candidates rather than a broad first pass you both have to sit through. The clearer your list, the fewer showings it usually takes to find a real match.
It also helps to say upfront whether you are selling a home at the same time, since financing and possession dates on both transactions usually need to line up. A mortgage pre-approval, typically valid for 90 to 120 days, is worth having in hand before your first showing so you know your real number.
Get your hand-reviewed valuation from Joel Dyck.