Ah yes its difficult without money. Maybe you should try to do salaries like maybe overall * base amount salary lets say 1000
So base salary of 73 overall player would be 73,000 maybe you can even different the salaries example 90+ ovr players 90,000 * 1,5
80-89 80,000 * 1,4
70-79 70,000 * 1,3 etc.
And some floor salary lets say 50 overall and less have all 50,000 salary minimum
The just calculate some salary cap maybe, so if you have 70 ovr player his base salary would be (70 * 1000)*1,3 and you cant sign him lower than his base salary.