again your question is vague an un answerable......you could do 10,000 crosses in one year....you could do 10....
you mean to tell me that the answers you seek are not out there on the interwebz already??? i believe your either bad at searching or lazy....
im not judging anyone im simply saying if you want a good quality answer no one is going to give it to you...everyone will have different variables and experiences in mind and none of them could pertain to your specific situation....research is what is going to give you the most knowledge to answer your question so that is supports your specifics.
as far as polinating shit you dont want to polinate...its called be carefull with microscopic pollen. do it in a controlled enviorment without a ton of airflow.
as far as how many crosses maybe 3 if your using only the plants you have already grown and crossed.
dont be a dink because someone told you to educate yourself..it wasnt a insult it was some solid advice.