Magento fix up. Need an Australian Magento expert!!!

Overview of my business so you understand what I am doing. I am a Barber and Massage Therapist. I sell services - working mobile mostly, and I sell products to people face to face and on this new Magento online shop. I am trying to set it up so I can add physical products and virtual services to add to a gift certificate to send out with free postage, OR just physical products to send out with accurate postage- hopefully using an Australia Post plugin for Magento. I just got a Magento eCommerce pages setup on my site but I am in Australia and they were in India and the communication was terrible and it has taken 9 weeks to produce this: [login to view URL] and click on either Buy Gift Certificates or Buy Grooming Products to see the pages added to this site. It takes over 9 seconds for a page to load. It seems to have slowed the entire site. I cannot work out the postage. I am not using Magento Enterprise. I need to be able to make certain sub catagories have the ability to allow me to add the post manually and other sub catagories to use the Australia Post plugin. I am a small business and I have to use Standard Parcel Delivery and not eParcel which requires the user to send over 1000 parcels a year. What is the correct Magento Australia Post plugin and setting for my site, and how can I make it integrate only to certain sub catagories and not all? I just want options in the 'Manage Product' section to choose postage settings per item. I need someone to come in an fix up my site. Please speak GOOD English and be in Australia if possible. I need you to be completely familiar with the Australia Magento setup.