SAP Beginner info needed

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I hope this is the right place for this post.

I am an experienced java programmer who is beginning to learn about sap. Currently, my project is to rewrite a large web application that previously was plugged on Oracle and an IBM mainframe and to plug it into sap R/3.

We are using WebSphere(probably 5 or 6), thus JDK 1.4 or higher. WebSPhere runs on solaris 5.8. Locally, we use wsad 5.1.1. (This architecture cannot change)

Being in the exploratory phase, I would appreciate some guidance, here are some questions:

1) Which connectors should we use ? XI, JCA, JCO, SOAP, etc...

2) Does SAP offer a JCA implementation which I may use in WebSphere ?

3) Where may I find more information about controlling transactions ?

Please feel free to offer any other advice also 😊

Thanks in advance !