It’s good to understand the end game early. Nothing is carved in stone, but especially with multiple founders, the earlier you talk about exit, the better. A term sheet negotiations is the wrong time to discover one founder want to take on equity and the other does not.
For that matter, you should have that conversation with yourself. An advisor can facilitate the conversation and the thought process for you. Ask the tough questions. Plan scenarios and understand the details related to each possibility. You can’t plan when opportunities will land in your lap. Don’t be surprised. Be proactive.