461492 Oscommerce Delivery Options

I am looking for a PHP expert with experience in OsCommerce for the following jobs (Please do not send me bid offering me a website as I have one already and need help with it)-I NEED THIS DONE ASAP. I have people that have emailed me before then I cant get hold of them 1. I currently offer local delivery to the immediate area 'Greater Durban' and these deliveries are run in-house. Some products will require two deliveries so I need the facility to choose if there is one delivery charge per product. An example of this would be some of the bulk loads we deliver - for example we will do up to two cubic meters of compost but if someone orders 4 cubic meters that means we have to make two trips. 2. We are currently looking to expand Nationwide. Not all products are able to be transported by the couriers we choose so I need a page to come up when a client enters the site with an interactive map or area list so the customer can choose their area. BEFORE THE CLIENT ENTERS THE SHOP THEY MUST CHOOSE THEIR LOCATION AND THE SITE MUST ONLY SHOW THEM PRODUCTS THAT WE CHOOSE TO DELIVER TO THAT AREA. This must then show the product categories that are available to that area - I am not sure if it mean duplicating the shop in some regards - I am happy to take advice on how best to do this. 3. Post, some items if bought alone need to be offered with the option of post as opposed to delivery or courier - if this item is purchase along with other items then the customer needs to be able to add the item to the courier option which will then take into account the combined weight and charge extra if the whole delivery weighs more than a certain amount (I believe 15kg is max and then a surcharge applies after this point) it is a complicated setup so if anyone has better ideas I will be interested in hearing what you have to say - otherwise please quote accordingly.