quick creation of Instagram campaign

I need to sponsor two Instagram posts already existing. I don't have a Meta Business Manager, so we need that the campaign is created by the business manager owned by the freelancer that we hire for this work. The promotion must be online starting next Monday morning, so we need immediate availability. In addition, we need that the meta business manager of the freelancer that we hire, has already been used (with several thousand dollars spent for advertising) because the daily budget of the campaign will be about $ 250, and with new business managers it is not possible to spend these figures (they are limited)

So please ask that the candidates are:
- willing to use your business manager
- that the business manager is already used
- immediate availability