Connect Alfresco with an ERP for document management

[shibu]

I have a requirement to connect Alfresco with an ERP(Developed using DOT NET technology.) for document management. The requirement is like;
When the ERP users uploads documents, those documents should be stored in Alfresco by following some document structure. Each ERP users will have an account in Alfresco, So while uploading documents in ERP, an API should be provided there to save those documents in Alfresco of that particular user's account. And while ERP users trying to download their documents, those documents also should come from Alfresco. So how can I create APIs for achieving this requirement?

I am new to Alfresco, so please tell me, where I have to start , and what are all the things I have to do for this….?

[mitpatoliya]

You need to create some connector using what ever language you are comfortable with.
You can use the alfresco webscripts or CMIS services which expose the alfresco repository to other application.
http://wiki.alfresco.com/wiki/Web_Scripts

[shibu]

I am planning to do with JAVA code. Could you give me the example POJO to upload a file into Alfresco account of a particular user?

[mitpatoliya]

You can refer SDK  FirstWebservice client example