1st need to check the site to decide whether need to do new design or we can go with current one , Please share the URL to check current and understand the flow the site for better modification .
I have go through your requirement and understand that you have a website and need to add some additional features and if needed then change the design.
I have some question :
1. If you already have website then why you need facility regarding register, login, edit their profile, Sorry it make me confuse.
2. Any way next question is, what do you mean by "submit listings", Is there is any facility to create lists.
3. Question regarding point 4. User can control the listing from front end dashboard but after that this listing will display where, is it only for user or for every one.
4. There are 2 type of user, 1 regular and 2nd Dealer. Is there any payment facility at the time of registration for Dealer type user.
5. What is the role of regular users
6. When Email Notification will generate and to whom.
7. "other special features" what do you mean by the this.
I hope, I am not making you irritated with my questions.
All this question are necessary and in your favor , and helpful for me to understand the project properly and complete the task efficiently
There are many thing to discuss, Please come to FL chat for free discus.
I have 10+ year experience in advance web development , I can easily fulfill your requirement