No Google Play Store on Samsung Galaxy Ace S5830 I have a phone, Samsung Galaxy Ace S5830, with an Android version of 2.2.1 Froyo.

I do not have Google Play app on my phone. Can I install Google Play app with this specific Android version?  If not, how can I do it?

I just don't want to use the manufacturer's product. There must be a way.
You can install a "minimal Google Play" 

http://forum.xda-developers.com/showthread.php?t=1918484