We are exactly at this stage right now. Bootstrapped, enterprise SaaS, ready for initial sales. This post could not have been more timely for me.

I'm not sure if this is possible in your niche, but we are partnering with a consulting company which provides services in the same industry/niche. We will give them a cut from the sales to do this exact process. Many leads will come from them as well. I could not imagine doing this any other way at the moment. Eventually we will certainly hire a full time salesperson.

edit: we got really lucky that this consulting company had some biz dev people who used to do SaaS sales at a previous employer.