I used to have my own little business, but sold it when Oli was about 4 months old, as I just couldnt give it the love and attention it needed! Some things to consider -
Can the product be bought anywhere else in NZ / Online - if it can, then you will be competing with someone else, mainly on price. This isnt a huge problem, but will eat into your profits, and can also make it harder to get business if the other places are already established brands / sites.
How much time will it really take? Factor in website maintenance, packaging up the products to post, trips to the post office etc (one of the reasons I found my business hard, was that the product was heavy and carrying boxes to the post office to post whilst trying to manage a baby in a capsule was just too tough!)
How much space will you need to store the product?
Will it get busy at christmas / other specific times of the year - can you cope with the extra work?
How will you repsond to orders when you are on holiday - will someone else do it?
Sorry - I dont mean to sound negative, but I think that there are some "truths" of running your own business that a lot of people dont think about!
Good Luck!