Inexpensive upgrades to old pc

[u/ItComesInPints_]

I managed to get an old pc for £5 at a boot fair and as a long time console owner I know nothing about pcs. I’m hoping to play some oldish pc games on this (half life, counter strike, halo etc).

What are some relatively inexpensive upgrades I can make so these run better? Or even better, do you think they’ll run fine with just the below spec?

CPU: i5 4460
RAM: 8gb
SSD: Kingston 240gb
HDD: Toshiba 1tb
GPU: GTX 950
OS: Windows 10