Hi Friends, Kindly help me....... Very urgend

I have created a node with following properties,

1. Sub heading
2. Content
3. Id

I have added 56 records to umbraco DB using this node. Means 56 times I added new content into node and press save and publish button. Everything I have seen in umbraco DB.

My question is,

1. How can I retrieve all thee items using API?

2. How I edit particular data using umbraco? means I have mentioned above I have created 56 ites, suppose I want to edit 10 item, How can I do this?

   Please help me very urgently.

Friends you can ping me through skyp also My Skyp name is Rahul K and skyp mail id is [email protected]