Welcome to the forum.
You are setting up a business to do what you know well and can do better than other people. You don't know databases - learning to make your own will eat into your time, money and patience and even then, it will not work as well as a professional one. Buy one from the professionals who know how to do it and who have done it hundreds of times before.
Ask Ms Google what she knows about
small business database solutions - she has 26,000,000 suggestions.
Search for organisations which help small businesses in your country - in the UK there are many including
smallbusiness.co.uk which has
Six signs that it’s time to change your ERP software. Can you handle any of the six?
If you want to progress with Base - trust me, you don't - then check the Business and Paid Support forums on
this page.
Base is not the easiest of applications to use. Search the forum with business for ideas (
https://forum.openoffice.org/en/forum/s ... mit=Search) - it threw up
Using AOO Base for Small Business Sales and I agree 100% with what it says.
See
Database Examples and the other forums
here.
Search the libreoffice.org site for documentation - the
LO Base Handbook is better than the AOO Base manual at
AOO documentation.