Does anyone know how many episodes season 5 is going to have(in numbers I mean..like 22,23,24or more)? Cause so far every season had a different numbers of it.

CBS hasn't released any information past the 2/10 episode yet. However, if wewe check on TV.com, they tend to have the best information for the upcoming episodes (titles, number, air date, etc.) on their episode guide.
The link is: link

Good luck!