Customizations on magento store

We've got an online store, which require few changes on shipping part. The store has got multiple locations 1. Restrict shipping to 4 districts, these districts contains 100's of locations. we'll provide DISTRICT POST OFFICE PIN CODE NEAREST SHOP KMS The first 3 KM is free and exempted from shipping cost. for the rest of KM's their is a cost associated per km. The user selects the district from a drop down, on select the localities(PO names) are shown on another select box. when the user selects his PO, the pincode is automatically filled, and the nearest shop, kms are shown. and the shipping cost is calculated and that also shown to the user. This data needs to be seen on the dashboard also. 2. Create a shipping calculator on the home page with the given details. 3. Add a landmark field to the shipping, and a check box to know whether its a surprise gift. 4. Delivery Date Field, Delivery Time Field Looking for freelancers who like to have a long term relationship, and can work on future enhancements and support of this store. Please excuse to those who're not expert with these technologies.