It is never too early to create a PTCAS account! PTCAS is the heart and soul of applying to DPT and PTA programs. 

Resources:

PTCAS Directory By School-https://ptcasdirectory.apta.org/5287/Comparison-of-Course-Prerequisites-by-Program

APTA/PTCAS Home Page- https://ptcasdirectory.apta.org/

Registering for GRE- https://www.ets.org/login.html

Instagram: 
@preptgrind has great tips and information about standing out in your applications
@theptwriter, Jasmine Marcus PT, DPT, CSCS is a great resource for editing essays