Create meeting before buy lisenced will the meeting upgraded?

Yes, that is an option if you so choose under your current log-in credentials.  Schedule your meeting with your Free/Basic Zoom License and once you upgrade to Pro, you will have the Zoom License you will need with no short-term time limits and other value adds.  Here's a helpful blog about it too: https://blog.zoom.us/the-many-reasons-to-upgrade-from-zoom-basic-to-pro/