Complete a service ecommerce wordpress website

Need to complete an unfinished website. Needed to add gravity forms or any kind of forms to make users upload files to wordpress. Plus need to edit some animations in how the pages change and the forms are shown to the user. Because the forms will be shown to the user in the form of question after the other that disappear and appear in an animated way. Not just a static form. The files to be uploaded will be text files. Or links to dropbox sites for large video files. We need to add a payment link via paypal when the user uploads his files he will receive an email sent by the administrator with the quote or the sum he needs to pay for his job to be done with a link in the email that will take him to the website to sign up and then see his invoice and pay. The user can also have a history of the files he uploaded and payment history and the process of the open jobs. Like if a file is in processing stage...or waiting for payment stage. Or completed stage and the file was sent to him for example. Project timeline 10 days.