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First of all, get a business plan, containing your short term and long time goals, specifing your key area then starting with the short term goals, when you've raised enough funds you then go for the long time goals. If you can't draft a business plan get someone to help you write it, there are lots of agencies doing that for a token.
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Dear Kwabena Abdu, For wellness and fitness business, create an account in cybal field, social media platforms, like Instagram, Whatsapp and Facebook. A professional account, run adds, market online, offline and also market through your influence. You should also buy some gym equipment like dumbbell, skipping ropes etc. You can get a spot for your training, if you are starting with little or no fund at all but if you've got enough funds, you open a gym house and run your advert offline or online.