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Make sure you exercise your core muscles - don't go overboard if you're just starting out and make sure you include some good stretches before and after.

Look at how you're sitting, make sure your chair gives you good support for your back.

Look at how you're sleeping, a bad mattress can give you all sorts of problems including back pain.

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How would you recommend 'looking' at how I sit/sleep?

There will be better sources of how you want to be positioned when you sit and sleep than this - but in general you want to be thinking of the positions of your hips, pelvis and spine. Good positions tend to keep your hips aligned and pelvis level. Viewed from the front/back you want your spine to be straight and viewed from the sides you want that natural S curve (that's the reason that chairs these days have lumbar support).

If you are struggling to visualize how you're sitting then try recording yourself while working.

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