Outgoing payment query

Hello all! Your help is much appreciated. I am trying to see if it is possible to do the following

1. Sort by transfer date, customer name, and transfer amount in ascending order
2. Filter by transfer account _SYS00000000283
3. Add credit memos that I may have applied during an outgoing payment (scratch credit memo or copy to credit memo)

Also, I would like to learn SAP query language better. Are there any free resources that I can access to learn how to do this on my own? I have learned all that I can on my own, but besides the basics, I have a hard time with it. Thanks so much in advance!

SELECT T0.[TrsfrAcct], T0.[Canceled], T0.[DocDate], T0.[TrsfrDate], T0.[DocType], T0.[CardCode], T0.[CardName], T1.[NumAtCard], T1.[DiscPrcnt], T1.[DocTotal], T0.[Dcount], T0.[TrsfrSum], T0.[TrsfrRef], T0.[JrnlMemo] FROM OVPM T0  INNER JOIN OPCH T1 ON T0.DocEntry = T1.ReceiptNum WHERE T0.[DocDate] >=[%0] and T0.[DocDate] <=[%1]

-Jessica