With the SPX at about 1256, let:
Sell 10 March SPX 1320 calls -SXYCD
Buy 10 March SPX 1335 calls - SXYCG
Credit of about $.80 ($800)
You may be able to catch another nickel, but $.80 is realistic at this writing. Always double check the symbols before placing your order.
No additional maintenance should be necessary (IF you have the right broker).
Good luck and trade smart!