Might be late but the main issue here is cost.

If we are talking about immediately after the independence, then the book "The Mexican Right" is bar none the best.

However, that book is around 100 bucks as its been out of print for a while.

The only place to find good info is through books, especially ones published through a University. Never trust the internet as you'll only find propaganda often published by Americans who want to push the idea of a hostile Mexico.

If you have no money, you can exploit google books to read most pages for free.