Set up Sage Instant and do on-going book-keeping for online sole trader

I am a sole trader mainly selling (bondage) rope and instructional DVDs online via Amazon and eBay to retail customers. The entire inventory is currently around 100 items but these are mainly variants of a few items, e.g. pack size, finish. I also have income from trade sales, a small member site, tuition and performances/shoots. I plan to set up a separate partnership for trade sales and some other items of income to keep me below the VAT threshold.

My requirement is for somebody to set up Sage Instant, which assumes a good level of accounting knowledge, and do my book-keeping on an on-going basis. Initially, I feel this would best be done on-site (Camberwell, London SE5). When a system is in place book-keeping could be done by post or collection.

Knowledge of Linnworks and integration via Tradebox with Sage would be a massive advantage but not essential as I have posted a separate job.