Selling a home that doesn't exist yet is a different job from resale. There's no showing, no inspection and no comparable sale of the same unit. You are selling a floor plan, a set of renderings, a finish board and a completion date that may be two or three years away. Your credibility depends on those materials being right, because your client will compare them with the finished home, and they will remember who showed them what. A presale agent's reputation is built at completion, years after the commission was earned.
On the project side, a developer usually appoints a project marketing firm or an in-house sales team. They run the registration list, the display suite and the launch. In BC, the developer files a disclosure statement before marketing and selling, and the buyer gets a seven-day rescission period after receiving it. Deposits are usually paid in stages and held in trust. The sales team walks buyers through plans, pricing, the deposit structure, strata fee estimates, parking and storage, and what happens if the completion date moves.
On the outside, co-operating agents bring buyers to the project. Most projects publish a co-operating commission and a registration rule, which often requires the agent to register the client or attend on the first visit. You compare projects for your client, explain the disclosure statement in plain terms, help them rank homes on a worksheet at launch, and then stay with them through a long wait. If they need to sell before completion, you may handle an assignment, which usually needs the developer's consent and in BC is reported to a provincial register. Licensing and exemptions vary, so check with your regulator. Through all of it, the question you hear most is simple: what will it actually look like?