What are some basic business management systems a start-up should use for sales, marketing, finance, and administration?

Frankly speaking I think you should start from reading more reviews. My advice is this business management system for translation company https://protemos.com/tms-for-translation-agencies.html I respect the most. If you want to know more about the company it’s best to take a look at our amazing projects. What I like the most is that this tool helps combine all your processes into a single system. Hope it can help

Thanx for sharing.
I appreciate it a lot

Right now I try to support my business with https://osome.com/sg/company-secretary-singapore/ which provides me with all the information on how to start and support a business in Singapore. They will help you to make any business from scratch and share some advice on how to keep this your business afloat. There you can also find a personal secretary for your business.