Just for now, put aside worrying about the driving, cooking, or even talking to girls. You main focus right now is that you landed a job. Put your energies into simply doing the best work you can at your job, and being a good and useful worker in the position you've been given.
As others have said, be friendly and polite with co-workers; return a greeting with a similar greeting. Try to smile while greeting someone, or nod a greeting. At first I would recommend that in any conversational moments, let others do the talking and listen to the conversations rather than dive in and take part -- this will allow you to start to get to know your new co-workers, and to gauge what kind of person each of them is.
Then gradually you can start responding or speaking up in those moments where chit chat is happening, on breaks or wherever.
If there are female co-workers, just think of them as no different from the men -- ie, just people -- and don't get flustered wondering if one of them might be potential dating material. Right now that's something to worry about much later -- your main focus is to be just being a good worker and getting along with the new people around you even if it's just as a quiet observer at first, socially speaking. Don't think beyond that right now.
For food at home in your own place, wait until you've adjusted to your new work situation and feel you've settled into that, before you tackle other projects such as learning to cook better for yourself, or learning how to start meeting girls.
The reason for this is that too many new projects of self improvement or life changes can be too overwhelming -- even for NTs -- so on the spectrum it can feel even worse. The key to anything is not to "bite off more than you can chew." Whenever I can in my life, I try to only have ONE new thing to tackle at a time, rather than several new challenges. It's overwhelming when every moment of you day seems to be packed with yet another activity that is a new challenge and learning curve rather than something familiar.
Keep it simple for now and take one thing at a time, even if it means eating microwave meals, a lot of fruit, or a lot of sandwiches for a short while.
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