This is a general comment not aimed at any particular poster.
Formation flying requires a complete and comprehensive training program in order to do it safely. Mine consisted of an initial 10 hours of dual provide by an X Military QFI and Snowbird Air demonstration team member. After that I did many hours of practice with a very experienced lead. With about 160 hours of form experience I now consider myself a reasonably competent formation pilot.
You Can Not teach yourself how to fly formation yourself and to attempt to do so is very dangerous. I am very careful who I fly formation with and will not fly with a pilot I do not know without a recommendation from a trusted source.