I'm currently using a 3rd party store application for my stores, a custom one that I rent from a private company. It's not oscommerce or any other well-known store application. My intention is to migrate to Magento as it offers better performance, function and modules. I tried searching for migration scripts of all kinds, but there is nothing available to migrate the store system I'm using to Magento. So I decided to get in touch with professionals like you to solve this for me. The data that I need migrated from my current stores to Magento stores is basically: catalog with product descriptions, images, categories, prices, cross sells, up sells, and other product data; customers with profile information, orders history, etc. orders information, including products purchased, financial information, etc.. I'm not looking for a single "migration task", what I need is a "migration script" that I can use to convert this 3rd party stores to magento stores each time I need.
I can provide a copy of the webstore files and database of one of my current online stores for you to review.