Send idoc to other system via SOAP

Hi,

I intend to implement an interface with other system non SAP, to send idocs via SOAP.

I've read some documentation on sdn but i'm very confused about Was / XI / BSP and some others terms.

Please, can someone help me, driving me to the right way and where to start ?

I don't know either if this the best solution to send many idocs... I'm talking about 10000 idocs each time.

In advance, thanks.