CHANGE WEBSITE TO BETTER SHOPIFY THEME AND ADD

Hi I have a free website theme with shopify named debut [login to view URL] and would like to have a offer to switch to a paid theme from shopify which would works better for my shop. Can all the products stay inside and will be linked as is or does all need to be changed and reinstalled? Please inform Here is what I have. I have a production in Bangladesh for Jeans products and want to launch the brand jeansdream to offer jeansproducts for a family, or part of the family, kids, parents, their parents etc up to 16 XL in size. This is produced in Bangladesh and send to the buyers all over the world. We will make to Order MTO Or if customer has different measurement, customer can send a measurement and we can do Made to Measure or M2M. There are websites for M2M, but very costly, so I can not do this at this moment. So we want to offer Denim products from Bangladesh Accessories through drop shipping from Ali Express Shoes MTO and bags from another factory who has a website and should be linked to my website. Another website M2M for shirts from another seller. Please give me a quote To offer the best paid theme website from shopify who will be able to handle and let me website shine. To move all items from my website to the new theme, to adjust and organize the new theme, to integrate the other 2 websites into my website, to work together with the IT people from the website to know how to integrate, to help to set up social media accounts and offer training for our people how to do the continuation of the advertising. o When you see product, you see choose colors size option garment regular fit, slim fit, fit and baggy or some of them option add on 3 options which can be changed or not included Option could be what kind of design there is for lining, or some other option we can put into the field. Either we do or not for this item, we can use more or less options but there have to be 4 . When customer orders he look for color first, then he want to find the size and he/she can choose XL. Then the XL size spec will be available to see, with a button see size spec. The the next option is the fit and each fit will change the size spec, which customer can see and approve. Last option package would be an embroidery, and embroidered name, longer legs for upturning the jeans etc. But some items will not have any options, then we do not show. All colors we put into the back end and upload for the colors for this particular item the ones we choose All options have a price or are free and this will be shown and added to the cart when clicking for order. For example, S size is cheaper than 15 XL size, which has a consumption of 3 times S size. Furthermore there is another website to be linked, which is very easy because is already prepared Website ready to go, only link need to be established, IT specialized from the company I will link to knows everything and it will be not more than 30 minutes to do the link. [login to view URL]