My cheap advice is to make sure you have the fundamentals covered with lenses that are sharp and clean, exhibiting low levels of chromatic aberration and distortion. (Get used to Resolve’s tools for correcting these – they’re quite powerful.)
I love to shoot fully manually (mostly with primes) so I have a range of inexpensive old Nikon AI-S lenses that have this covered. A few of my favorites:
Nikkor 28mm f/2.8 (super-sharp normal)
Micro Nikkor 55mm f/2.8 (great macro and short tele)
Nikon 80-200mm f/4.5 (my only zoom)
Ken Rockwell’s reviews are helpful for choosing the best versions of each of these. (I know, I know … opinions diverge on KR.)
Once you’ve got that taken care of, you can get some fantastic “character” lenses for a song. I’ll probably catch some flack for this, but I’ve been picking up some of 7artisans’s lenses for less than $150 each. Used judiciously, you can get some wonderful bokeh from these. (Meike lenses are likely better all-around and cover the same bases, but I chose the 7artisans lenses
specifically as effects lenses.)
For me, these are pure, cheap fun. First, their 35mm f/1.2 (!):
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And their 7.5mm f/2.8 fisheye, before and after Resolve’s barrel distortion correction (note that I haven’t fixed the chromatic aberration):
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These are all a little dark – they were all shot on dank, overcast New England days, with no additional light for the interior shot. But I wanted to show that while they’re not primary lenses, the 7artisans lineup can definitely be useful for someone on a budget. (I realize that some of the lenses I mentioned – like the Nikon tele – really aren’t appropriate for OP’s one-room shoot, but I wanted to provide info for others who might be drawn by the post’s title.)