Need oscommerce Specialist for (custom made) contributions

Hello Freelancers We got a internetshop in the netherlands and want to have some new (custom made) contributions Al the url I use are examples, so you can see what we want. 1.404 error page (for example [login to view URL]). This page must be in the style of our website, with our navigation, and a search box. the error page may not be the homepage! [login to view URL] installed seo url’s but we want the url more clean. Now we have for example: [login to view URL] We want: [login to view URL] [login to view URL] the url’s of the products etc. without ……..html [login to view URL] build a product filter. But the filter have to be more search engine friendly. Now the filters makes url’s like: [login to view URL]|1memory1024. Also the meta title doesn’t change. We want url’s like: [login to view URL] -1024 Also the metatitle of the page must change. We want to give the meta titles our own description See for example: [login to view URL] [login to view URL] the nexst pages got url’s they are not sef. Something like: [login to view URL];sort=products_sort_order we want tho change this url in something like [login to view URL] (also the metatitle have to change [login to view URL] customers lay a product in the shopping cart you go direct to the shopping cart. We Want that customers get a pop-up with tekst (in Dutch) like The Product is added to your shopping cart. Also in the pop up 2 buttons shop further and checkout [login to view URL] want to let see a picture of the products in the shopping cart [login to view URL] want that people see the shippingcosts in the basket [login to view URL] Checkout pages like [login to view URL] at this time people have to make an account. I want that they checkout without a account but when they are ready with the checkout the get on option to do that in de checkt_out success page Thank you!