I work at a company that is looking into "upgrading" our version control system. We have about 200 websites that operate in their own directories. However, all of these websites use the same shared code. We basically use the 200 directories for the display code (html/css) and then the shared code for the processing and database queries. Its a little more detailed but I'll leave it at that for now. We also have a backend system that primarily uses shared code only.
We currently have multiple programmers and multiple coders/designers that all need access to the code on a regular basis. Unfortunately our shared code isn't exactly modular, so it is hard to split something off into a "project" when something needs done since so many files are hit. I am basically looking for suggestions on the best workflow available for a version control system. As far as we can tell from research, git seems to be the way to go. But being the version control newbies that we are, we still have concerns on general workflow. Can anyone give me any advice on this topic?
Edit: I'm trying to be a little more detailed, hopefully I answer some questions from the comments. Pretty much anyone is allowed to change any code at any time. If a change is made to shared code then it is immediately applied to the central code base. We don't really have a versioning scheme. We used to in the past but it was never enforced when new developers were brought on board. The shared code is clearly separated from the rest of the code. There are a few files in our system that get edited a lot. We are constantly "stepping on each other's toes" with these files. These files are very important to our system. I'll be the first one to say this is not an ideal work situation. We are well aware these files need to go. We are in the planning process of modularizing them but we would still need to consider them when choosing a versioning system. I guess another good thing to mention is the fact that we have a large number of files. This isn't ideal either but its happened primarily from not having a sound version control system put in place. Many developers over the years would just save a back up of a file if making a significant change. This is another reason we want to move away from the current scheme. Thanks for your responses already.