abaqus problems

Good day to everyone....

Im new in the abaqus user... im here got some problem in my beginner stage:

 (i) what the units used in the abaqus? how can i ckeck it? 

(ii) what is means of the approximate size?

(iii) we can put the vertical load and horizontal load, but how i can put the load with the angle such as (10kN in 30o) 

(iv) how can i do if i want do the looping in my analysis, such as:

      after the intial boundary condtion stage, im obtain the stress and strain result then i want continue my analysis until the final result with equilibirum strain...    

      example:

      if e>0.0005

         P = X - 60

       else

         P = X + 60

      endif

thank you...