Why start this right now?

Because waiting is only costing you opportunity, you could continue to fumble around on your own. Ask your friends how they got their book deal. Read some books on how to do a book proposal. Still, if you don’t know the ins and outs of the industry, the items agents and publishers look for, or how to tell the difference between a winning salable concept and a clunker, you’re going to waste a lot of time that could be spent basking in the accolades of being successfully published.