In 2007 Berkshire Hathaway annual reports, Buffet wrote about the traits he looks for in any acquisition. They are:-
1) At least $75M in pre-tax earnings
2) Consistent earnings growth
3) Good return on equity
4) Manageable or no debt
5) Quality Management that is committed to the company
6) A simple business model
If you are purchasing your first stock to build up your investment portfolio, maybe you can use it as a reference. You may need to relax condition (1) a bit if you are investing in the local market as the companies are smaller.
I used to infrequently buy, hold and then sell some stocks in the past. But when I started to build my current portfolio from an all-cash position in 2008, my first stock was SPH.