In some areas diseases and root rots will build up affecting the beans, in other areas 10 years of beans on beans is not a problem.
In general 2 years of beans should work out fine, I'd want to know more about your location and switch up the bean varieties for different resistance packages if you want to go more than 2 years.
Naturally beans create their own N so you won't need that. Assuming you didn't fertilize much last year, getting 50 lbs each of P and K per acre would help you out. Beans seem fine with broadcast fertilizer. Remember, your fertilizer is only 60 or 23 or whatever % P or K, so you might need to add 400 lbs per acre to get the right amount of actual nutrients....
What is the soil ph in your location? I'm in a high ph area so not a concern for me, but in many areas, low soil ph below 6 will lock up the soil nutrients, preventing roots from prying them loose from the chemical bond to the soil. This makes lime the most important thing you can do, if your soil is low ph. Lime takes several months to start working, so if needed, sooner is better, and can last for 5 years or more. Depends what type of lime you use. If needed at all.