internal table to idoc

hi all,

my requirement is as follows:

i have to fetch data from an excel sheet to the sap system for the creation of business partners.

this has to be done using idocs.i am new to idocs.till now i have been able to fetch data into an internal ttable from an excel sheet.now i need to populate this data into an idoc.

1)how to go about this?can anyone give me sample code.

2)also once the data has been fetched into the idoc how to create new business partners with this.i m working on crm5.2 application

i will be grateful for ne help.

kind regards

shilpi pasricha