Problem with calling RPG from CL and to Submit

Hi - I am working on a report that used CL and RPG programs. The first CL calls 
an RPG that prompts for date. This RPG Currently then calls a second CL, which 
does the rest of the job. I would like this call to to go into Batch instead of 
currently as interactive without having to code a new CL that will simply 
Submit the second CL, Is there a way to do this? 
Another problem I noticed is that when I did create the additional CL to submit 
the second CL, I entered dates (from ?to) twice and a second job went onto the 
job queue. When this second job ran it bombed on a data decimal error. Do I 
need to close Files or something else to ensure that this wouldn?t happen again?
Thanks,
Rob