I am prior service Army (released from active in May 2020) and want to join the ANG to tryout for TACP. Care to enlighten me?

Air National Guard is still a Reserve Component. You don't PCS, there's not a choice of base or anything like that. You work at the base closest to you where your job is.

A few seconds of Google search will tell you what you need to know about the ANG AGR program

https://www.ang.af.mil/Careers/State-Active-Guard-Reserve/

I have a friend that Recruited for the Air Guard. They don't have an Active TACP unit. They have admin jobs at all reserve units that you can try to obtain but it is a bit of a process and they are highly desired. You may try to deploy by volunteering to go with an active unit but if you don't have the rating they need then you won't go. You rank is not as important as your qualifications in the TACP land. They are not all the same. TACP is a challenging job. I know they seek out combat arms but they have a bit of a wash out rate. They have a selection school if I am not mistaken now.

TACTICAL AIR CONTROL PARTY MISSION

Tactical Air Control Party members are part of the Special Operations team that lives by the motto: "Advise, Assist, and Control". They diligently work at protecting America and its allies in the global war on terrorism. These specialists are easily identifiable as they have earned the right to wear the coveted black beret. They provide numerous critical functions on the modern battlefield, including advising ground forces on aircraft deployment and capabilities, coordinating and controlling aerospace operations, and participating in battle planning.
https://www.goang.com/discover-ang/missions/special-operations/tactical-air-control-party-mission.html