Make specific edits on wordpress theme - Checkout process

I need some changes to be done for [login to view URL] Regarding the car submission process that can be found here ([login to view URL]) Changes needed: Step 1: 1. The label at the top saying Have an account? Sign in If you don‘t have an account you can optionally create one below by entering your email address. A password will be automatically emailed to you. Needs to be: Have an account? Sign in If you don‘t have a dealer's account, you don't need one! We will create a password and email it to you so you can make changes on your listings. 2. Right next to the featured photo field it says (optional) but it is not. When you leave it blank, it comes back and asks for it. Please make it optional. 3. Default Fuel Type: Gazoline Default Vehicle Status: Used Default Vehicle Type: Saloon 4. On the right side of "Doors" field we need an extra field named "Cylinders (optional)", when the listing page is completed, this should appear the same way as the "door" atribute appears. 5. "Your email" field to be removed 6. "Enter Vehicle Description" change to "Vehicle Description" We want this field to be optional and move it further down, under the Images fields. Also have (optional) next to it. Step 2: "Proceed to Checkout" to become "Proceed to submission" Step 3: ([login to view URL]) On the left side, I want the "login form" with the title "Already a member?" Right under it but still visible in the first screen, the new customer form. The New Customer form should have a title "New Customer" Only First Name, Email & Phone number are required All other fields are optional New user registration now creates a New User with the role of "customer", I would like every new user that submits a car to become a "Vehicle Dealer" user.