Yes I can help you to customize your purchased script. You said that you want to customize the home page. So, can I know how much and where you want to have changes? Same for the registration page, you want me to add or remove some fields?
I believe, once the registration is done, the user will be taken to the subscription list page, where different subscription plans will be listed, user needs to select one and those and the registration will be completed after the completion of the successful payment.
Please correct me If I am wrong anywhere, regarding the subscription plans, these all will be managed from the admin panel. Will add an option to add discount also, so, if you want to promote any of those you can put a discounted price.
Honestly speaking, your budget is not practical for me. I can be wrong too. So, tried to keep a reasonable rate, Please feel free to leave a message, at least we can discuss the requirements.
Thank You.