Magento Multi Vendor / Drop Shipper Support Extention

I have a Magento Store that is made up of various dropshipper clothing. I have been entering the products into the database myself and this is becoming too difficult and time consuming. I would like to create a Multi Vendor / Drop Shipping feature in my Magento admin area where my Drop Shippers / Vendors / Manufactures will be able to login to my Magento site and be able to add/delete/edit their products. Magento Administration can be extremely confusing for a novice, I need the Vendor Login to be basic and user friendly. (Please note..I put a lot of information below because I wanted to be clear. Some of the info may be unnecessary but just to make sure we are on the same page) Requirements: 1) Vendors can sign up for Drop Shipper / Vendor Accounts. I should later be able to approve/deny the accounts. I should be able to give approved accounts usernames and passwords to admin access. 2) Vendors given access should be able to login. And add, edit, delete, disable, and enable products to my Magento site. They should only be allowed to add products under their own Manufacturing / Vendor name. They should not have the ability to add products under other Manufacturing / Vendors names. - When adding a Product the Vendor must add to these fields: - Name/Title - SKU - Weight - Status - Enabled / Disabled - Price - Images (Would like the ability for them to add multiple images. The first image added is the main image and is displayed as the thumbnails and large imaged displayed when a product page is viewed) - Description - Custom Options: - Size (ex. Small, Medium, Large, etc) - Color (ex. Red, Yellow, Green, Orange) - Custom Option (if necessary. Some items may need a different option. For example, Jeans do not use Small, Medium, or Large, they have numbered sizes such as 32, 34, 36, etc) - Shipping Cost of the item. Unless they have a shipping account setup * All Product Should be added as Simple Products and Taxable Goods * Products should show up the same as they currently do on Magentos store. As if the products were added by the main administrator. 3) The products that are added should be in no way, shape or form different then the products that are normally added through Magento's normal admin system. I should be able to login to Magento and edit the products normally. 4) Admin, host and store owner accounts are separate from Vendor accounts and can supervise, manage and change all their information. Below I have options I would like in the extention/app, but I am not sure if it is possible to implement. Or not sure how much additional work it would be. Please let me know what you think. Desired Options: 1) After orders, emails are sent to each individual Manufacture / Vendor showing them orders for their products only. Should include the total amount that (their items only) were purchased for. Should also include the percentage they will receive for the order and the percentage I will receive for the order. 2) Option for Payments to automatically be sent to Manufactures / Vendors after orders have gone through. These payments will be sent via PayPal, credit card, or there merchant accounts. I know nothing about this option and am not sure if it is possible. But this is something I really would like to implement. The amount paid to the Vendor depends on my commission of the dropshipping service. If I receive 40% of sale for dropshipping. The Vendor is automatically paid (via paypal or merchant account) 60% of the sale, plus the shipping costs. 3) If Manufacture / Vendor have do not have Shipping Accounts with Fed Ex, UPS, etc, they can enter individual shipping prices for products.