shopify 2 coding modifications

Dear Sir/Madam, I am setting up my Shopify website and need expert help for some modification. I am using Shopify and the Brooklyn theme Shortly I need help to modify: 1) Hide color specific pictures on product page only to be visible if customer chose the specific color. There are 5 general pictures per product and then 6-8 different colors and these are the pictures that needs to be hidden. Each color also need to have an added text as it is different fabrics. The colors can be shown as small icons to be enlarged, pop up window or a picture together with the generall pictures. TOTAL 14 products 2) Ad information required during check out depending on product in basket. Additional information preferable included in the standard check out or if needed as some sort of build in function. If the customer buy garment 1 they should ad 17 measurement and if a garment 2 only need to as 5 measurement. Measurement should be possible to give in cm or in inches. Next to each fillable field there will be a picture available for pop up to describe and show how to take the measurement. Preferable measurements can be saved under choppily profile all design is as per rest of site set up by me/as per Shopify standard options. I would like to start asap so I hope to hear back from a developer with knowledge in Shopify. Regards Karin