WooCommerce WordPress expert for Long term job

I am building a large woocommerce site that has around 300 products. The client has sent me detailed product postage costs (lots of categories) including UK (home territory), Europe, USA+Canada, and the RoW. Some of these location will have mandatory tracked shipping - others will give the customer the option to upgrade to tracked shipping The business is based in the UK, and so I was thinking of using the Royal Mail plugin: [login to view URL] as most of the smaller size products are sent this way. Attached is the .xls sheet detailing the price + weight brackets (tab_1 = product weights. Tab_2 = postage costs) However, I am quite simply confused about how to set it all up in as simple way as possible so that we can maintain it... And also i don't know if we'll need an extra postage plugin, or even if the Royal Mail one is the best one to choose, or if one like this is better for us : [login to view URL] Finally although each of the 300 products has a weight, I do not yet have dimensions, and I'm not sure if they will be required (I can get this if need be) but being able to do it just on weight would be preferable. The site is on a staging server at : [login to view URL] you are welcome to click around, but do not attempt to buy anything yet. (PS we will migrate it to an SSL before going live)