You don't need to know about laptops, you just need to be able to use one, that and a search engine.
Right click 'my computer' and then 'properties'
Tell us what it says.
If it's this... then you'll probably get about £200 for it if you're lucky.
Memory (RAM): 2 GB
Display Size: 15.4 in.
Primary Drive: DVD+/-RW
Processor Type: Intel Core Duo
Processor Speed: 1500 MHz