I need magento website bug fix and some level of customization

General information for the website: We are selling beauty products Description of requirements/features: We are running ecommerce website to sell beauty products. site is running well but has minor bugs that needs to resolved are 1. Paypal express checkout not working 2. Invoice is not being sent along with order 3. Product page custom options are not working well. Need below customization. 1. Need a product builder or landing page for each category page. 2. Need a configurable product color options so that it changes the images accordingly Specific technologies required: magento Extra services needed: Customization Extra notes: Please send an only generic quote. No pre-defined quote has been accepted