I would like to make one form that allow to user to add post for my content-type. form will have all fields that I have created in content type. once user will submit the from then entry will automatically add in content-type.
You can add creation the new node in the form submit function
function custom_page_submit($form, &$form_state) {
global $user;
//Create new object and fill the fields;
$node = new stdClass();
$node->title = "SOME TITLE";
$node->type = "YOUR_NODE_TYPE";
node_object_prepare($node); // Sets some defaults. Invokes hook_prepare() and hook_node_prepare().
$node->language = LANGUAGE_NONE; // Or e.g. 'en' if locale is enabled
$node->uid = $user->uid;
$node->status = 1; //(1 or 0): published or not
$node->promote = 0; //(1 or 0): promoted to front page
$node->comment = 1; // 0 = comments disabled, 1 = read only, 2 = read/write
$node = node_submit($node); // Prepare node for saving
node_save($node);
// Display success message
drupal_set_message("Node was saved!");
// And you can specify where user shoul be redirected
$form_state['redirect'] = 'SOME WHERE'; // 'front' - if redirect to front page
}