Setting up a QA Environment for Web and Desktop Application Testing - Finance

Hoping you can help or direct me. Previously had a role overlooking a small test team and working on Manual tests with an environment that was already set up and didn't need to delve so much into how it worked. New role now, but I'm looking to set up a nice clean Test environment.

I understand a 'dummy' replica of what's out there already, it's just the logistics of going about it that I'm unsure of.

Some details:

I work for a company that works with payments, and they have both Desktop and Web applications. Front end applications (customer facing) are all web apps, and will need to be regression tested. Then there are web apps and desktop apps that handle the backend data, with the desktop apps being mostly tasks.

I'm wondering if I need to get the company to buy some more hardware, or whether I can pinch space on the already existing hardware to duplicate the environment. Looking to purchase or acquire some Testing and Test Management software in order to keep tests in check, but that's relatively simple.

Languages that the applications were written in are varied as well, PHP, java, VB6, etc.

Any help offered would be brilliant, and if you need more information then please ask away as I realise it's a bit vague. As it's my first time doing this I'm not 100% aware of what specifics I would need to mention.

Thanks.