Although I am not trained on this level, I hope to provide helpful resources for children 3-6 years old.
For my two children who are in primary, I have found the information at Info Montessori to be quite helpful. The lady who put together the site is trained at this level and she lays out each area: Practical Life, Mathematics, Sensorial, and Language very well. Within each section, there are sub-categories which allow the reader to follow the sequence of presentations precisely. So for me (who was clueless as to what age to present what material), this was very helpful. She also lists out a step by step presentation just like a regular album page and also indicated the approximate age level for the material. This was my guide last year and will continue to guide me this upcoming year as well.
“If we want to help the child grow near to God, we should, with patience and courage... This requires study and prayer. The child himself will be our teacher if we know how to observe him.”