Edit WordPress/WordPress plugin function

To describe things in the best possible way: Here are two websites: [login to view URL] (Using WordPress platform - my website) [login to view URL] (Using custom html platform) I need someone to edit the trasnfer plugin (picture [login to view URL] - image uploaded to see the transfer plugin form). The transfer plugin form of the WordPress platform should have the same functions as the one on the second(html) website. Please before you read the functions I want - have a look at the two transfer plugins What functions should the transfers plugin of the website with Wordpress platform have: "Pick up location" and "Drop off location" should use google map locations - with auto fill suggestions. In the wordpress admin panel I can enter "transfers availability" and price per kilometer. When two destinations are entered in the fields, there is given price per kilometer - the price should be multiplied by the kilometers using the google map. Have in mind all the details about cars/price... are entered via wordpress admin panel. Example: If you pick location "Berlin central train station" to "berlin schönefeld airport" in the transfer plugin ->In the next page it will show 3 cars with a price per kilometer. However I need that price to be multiplied for the kilometers that are calculated by google maps. So if the price per kilometer is 3.5 and the destination is 100 km -> the price for the whole trip will become 350. Another thing to note is that I will need a button integrated in the last page of the booking process. The button will be a payment one - with the following options. Pay on delivery -> Redirect to custom page Bank transfer -> Redirect to custom page Pay with Paypal -> It will get the total price and redirect to Paypal for a payment