Need to solve an Oracle Query 3 tables (Joins)

I am very new to Oracle and SQL and I have the following scenario which I need some assistance in solving.

Tables

AR_Invoice
AR_inv_no      GL_Code     AR_Amount      AR_Date
1234                11500         500.00               01/01/2015
2345                11500         300.00               01/02/2015
3456                11501         250.00               03/01/2015
etc



AP_Invoice
AP_Inv_No      GL_Code    AP_Amount      AP_Date
4567                12500         350.00               02/05/2015
5678                12500         275.00               03/04/2015
6789                12501         150.00               01/03/2015
etc


Tran_Doc_No
Inv_No     GL_Code     Reg_No      Type
1234         11500         ABC 122       M
1234         11500         ABC 122       F
1234         11500         ABC 122       R
2345         11500         ABC 124       F
3456         11501         ABC 121       M
3456         11501         ABC 121       F
3456         11501         ABC 121       R
4567         12500         ABC 122       M
5678         12500         ABC 124       M
5678         12500         ABC 124       R      
6789         12501         ABC 127       M

Most of the records in the Tran_Doc_No have multiple lines, there is much more info which does differ line by line but the only info I need from this table is the Reg_No

The only GL_Codes that I need in the query are 11500 and 12500

I have looked to I need to achieve the following

Reg_No       AR_Inv_No     AR_Amount     AR_Date           AP_Inv_No      AP_Amount      AP_Date
ABC 122        1234             500.00            01/01/2015       4567                350.00               02/05/2015
ABC 124        2345             300.00            01/02/2015       5678                275.00               03/04/2015


I do hope that I have explained this accurate enough, if not please ask.

Kind regards,

Keith