There are hundreds of financial ratio and balance sheet parameters available from a company's annual report. Surely some are more important than others. Try finding them and searching through many threads I mainly noticed broad statements with some exceptions. From another thread:
b. How many parameters do you use at ones?
c. What do you use as a benchmark to determine if the parameter is good or bad
d. Have you developed a grading system that incorporates them together as your 'first-cut' list