Barry. The short answer is 'Laptops don't up grade
Hdd's can be swapped for a bigger one' add more more memory perhaps. But that s it.
Even changing to a SSHD may not be feasable
You risk spending money on unsuitable bits and pieces Far better to buy a machinecro suit your needs.
Another way to kook at the problem is to change operating/systems W8 is very heavey for older machines consider looking at Linux Ubuntu or Mint both very Windows like in use' They can be run from a 'live'CD' to try and it is all FREE to download including software