How much does it cost to start a business?

A question and a challenge. I've run my own business before, it wasn't planned from the very beginning, and a little 'messy'. My acrylic jewellery business went ok, and I did have successes but it wasn't heading in the direction I wanted, and I couldn't visualise still doing it 5 years down the line - So I decided a year ago to call it a day and close it.

I always knew I wanted/needed to have my own business again, and have been thinking about it for a while - along with having one of the busiest years I've ever had (I left my job, did a 3 month intensive graphic design course, moved flat, got married, went on my honeymoon and got a new job) 

My new adventure and challenge is about to begin, I'm doing everything properly from the start, I've made some spreadsheets, and have a list of things I need to do, like registering my business and getting a business bank account - but the plan is to start with £100 and see how far I can get with it.

I'll be taking it slowly and starting with one product then I will hopefully add a new one every few weeks depending on sales of the previous one. My first piece is a print, and hopefully my next one will be an enamel pin.

Im excited and hopeful for my new venture, and hope to blog about it a little more than I have in the past.