In terms of which computers to use, I would suggest that you listen to suggestions from your software team, as to what type of device they prefer (Desktop/Laptop etc.,). The brand to go for? Well it's arbitrary, really - just go for the best local deal you can find. (Personally, I am impressed with Hewlitt-Packard)
As for useful Software:
Writing code: Notepad++
Testing Platform (Mysql and PHP): Xampp
Graphics: Gimp
Logos: Cooltext
All of which are Open Source (free)
As for useful Software:
Writing code: Notepad++
Testing Platform (Mysql and PHP): Xampp
Graphics: Gimp
Logos: Cooltext
All of which are Open Source (free)