I suggest you get advice from the SAS administrator where you are working. I can't really help you when I know nothing about the SAS environment you are using and also what computer resources are available to you. If you need to scope a new SAS installation properly then I suggest you take advantage of SAS's free service to do this - talk to your SAS account manager.
Regarding Development, Test and Production environments, talk to the IT people in your organisation about how they manage that and what they would recommend. SAS can help you design such a set up as well. Hiring expert advice is the best way to go if you are not knowledgeable in this area.