I need a Shopify developer for a few tweaks

Hello, I need help with the navigation in my header. It's currently just displaying my collections, but I'd also like to group them according to additional tags, for example like the website [login to view URL], under shop, you'll see collections, light, size etc. I also need help with my product pages. They are content heavy and I'm struggling to position the images. I'm also keen to have some bespoke formatting done to break up the text, maybe with some text on a colourful background or something. I'm also struggling on my product page to have the basic product information just above the CHECKOUT button and the rest below. It's all going below. I also want to change the size of the font for the heading, and have a different size font for the subheading, similar to the plant product names on this website www.patchplants.co. I'm also not sure how to add suggestions for complimentary products underneath. Thanks!