Your graphics card is very poor indeed for modern games.
If you only upgrade that, it will give a big improvement. Your ram is sufficient, although most games recomend 2 GB to run now days.
So just do the graphics card for now.
Samsung Galaxy S9 review
Wacom Cintiq Pro 24 and 32 review – hands-on
When is the next Apple event?
Qu’est-ce qu’Amazon Prime ?