I am interested in the dimension of algebraic stacks.But, I’m in trouble because I can’t calculate it.Are there any good reference or tools for calculating it? I use the “Champs algébriques” by Laumon & Moret - Bailly as a reference for its definition.

Edit:In particular,I want to calculate the dimension of moduli stacks of coherent sheaves and filtered(flag) coherent sheaves.