Custom Start Number for Order Numbers in Magento 1.5

Question

How do I customise the starting number for orders, invoices etc in Magento 1.5?

Answer 1

From magento's forum:

• by LindyKyaw (Magento Team Member), changing start number (through sql query):

There is a table in the database which stored increment id of order.
It is called “eav_entity_store” table.
You can check which entity type id belongs to which entity by looking at 
eav_entity_type table.
You can run following query to update last increment id for the order.

    update eav_entity_store
    inner join eav_entity_type on eav_entity_type.entity_type_id = eav_entity_store.entity_type_id
    set eav_entity_store.increment_last_id=3001 
    where eav_entity_type.entity_type_code='order';

• by FOOMAN (active contributor), changing start number (through db management tool) and removing "0"s at the beginning:

With a tool like phpmyadmin look at your database. In the table 
eav_entity_type you will find all entity types listed. The one of interest to 
change where the order number starts is order sales/order. Remember the 
entity_type_id (in my install it is 11). To remove the leading zeros 
(padding) set increment_pad_length to 1.


Next go to the table eav_entity_store. Look up the entity_type_id. Now you 
can change the value of increment_prefix and increment_last_id. If you wanted to 
have your next orderId to be 15000 set increment_last_id to 14999 and 
increment_prefix to 0.

Additionally you need to make a copy of this file
/app/code/core/Mage/Eav/Model/Entity/Increment/Abstract.php
to
/app/code/local/Mage/Eav/Model/Entity/Increment/Abstract.php 
    public function getPadLength()
    {
        $padLength = $this->getData('pad_length');
        if (empty($padLength)) {
           $padLength = 0;
        }
        return $padLength;
    }
    ...
    public function format($id)
    {
        $result= str_pad((string)$id, $this->getPadLength(), $this->getPadChar(), STR_PAD_LEFT);
        return $result;
    } 

Hope That Helps