A book from a college bookstore might be best. The IBM manuals can cause information overload in a hurry, but when you need the detail, they are the best.
You might try the "language reference" and "Programmer's Guide" that can be loaded (free) from:
I found the following book fantastic. It is quite old but a very good introduction for the novice.
A Simplified Approach to S/370 Assembly Language Programming by Barbara J. Burian
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