For Recurring document template we can use the following T.Codes

FBD1 - Creation of recurring document
FBD2 - Change recurring document (This is for changing of amount and recurring periods)
FBD3 - Display recurring document
F.14 - Posting of recurring document
F.15 - Display of recurring document

For Diff. run schedule recurring documents you can use this T.Codes

OBC1 - Creation of Diff. Run schedule Recurring document
OBC2 - Enter run dates for Recurring document
F.14 & F.15 steps are same

Steps For Interest Calculation you can use this following T.Codes :

OB59 - Define valuation method
OBA1 - Preapare automatinc postings for foreign currency valuation
FS00 - Assign exchange rate different key in loan a/c
F.05 - Foreign currencty revaluation
OBAA - Prepare account balance interest calculation
OBAc - Define reference interest rate
OB81 - Define time dependent terms
OB83 - Enter interest value
OBV2 - Assignmen of accounts for automatic
F.52 - Interest calculation