Should I put advertising at an early stage of development of a startup?

We made a startup. Worked a couple of months. Spent a lot of energy, energy, time, etc. In general, everything is at a good level :). But we had a disagreement. Ie, some people think that it’s necessary to immediately place an advertisement on the site (for example, from Google), while others believe that it is necessary to wait on the contrary for this moment (a couple of months) and then sell the advertisement on the site much more expensive (than just advertising from Google). How to be?

PS Each user will have his own account and he will do something there. And if the advertisement will disturb him, he will be able to pay a couple of bucks a year so that it does not exist. Ie here or immediately need to put an advertisement so that there are no problems or just do not put it. Since when a user does a lot of things there and an advertisement appears there, they can leave the site. Although it seems that sites like face-up and LiveJournal didn’t put ads right away, and that’s why their popularity didn’t fall.

PSS In general, when developing this whole business, we did not even think about advertising. It somehow suddenly appeared ...