Take your time and look at it as a two-year project. Don't spend a cent you don't have to for the first year and put everything into the business. Try not to take out a loan for anything and build out of profits and personal cash.
An accountant told me many years ago, if you're not making at least 33% GP you are not viable.
Bank your GST on every sale, as that will gradually build you a cushion to fall back on when you do have to start paying GST and tax. You don't have to register for GST but I found it better to do so as customers wanted a GST receipt and I was able to get GST refunds every period which went back into the business. Even now, after 2,1/2 years, I am still receiving a GST refund, but that won't last forever.
Work out what percentage of your home floor area you use for your business, such as office/workshop space and storage, and claim that percentage off your rates, mortgage and insurances. Keep a log book for your vehicle and claim that percentage for business use on your expenses, eg. fuel, WoF, Rego, maintenance, Insurance. Keep all records and receipts, (Wharehouse Stationary have Lever Arch files for $2 on special right now), and don't hesitate to call IRD with any questions. They are free, unlike an accountant, and will do anything they can to help if you are honest and open with them. They have let me off all penalties I ever incurred due to mistakes or failure to pay/report on time and have been very patient in explaining anything I didn't understand, they really aren't the scary monsters people like to paint them as. Unless of course you try to cheat and they audit you... 
Spend a lot of time considering your market and how to reach it with advertising. At first it may simply be a case of door knocking and introducing yourself with a couple of samples. Emailing is uncertain as you may not get a reply unless your email stands out. Find out what your customers want and think outside the square for solutions. People like it and respect you if you can solve their issues in a way they hadn't thought of before. Ask them questions, people like to talk and feel they are being listened to.
You personally are your business and personality wins over talent in gaining customers. If people like you they will use you. How you present yourself and deal with people will make the difference between success and failure.
Just my 2c...
You don't get to be an old dog without learning a few tricks.
Shorai Powersports batteries are very trick!
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