Tl; dr: choose a bulb (or bulbs) that give you about 30-50 lumens/ft2, and a color temperature of about 4100K
For the lumens output question:
The key component missing in your question is the size of your room. What you want to consider is not total lumen output, but lumens per square foot (or foot-candles). To look at it another way: we put smaller bulbs in our cloests, and bigger bulbs in our living rooms. Closets tend to be small, and living roombs bigger.
You can read more in this GSA publication for lighting guidelines for US Government office buildings, or you could get way into the weeds reading through the Handbook of the Illumination Engineering Society.
For the color temperature question:
This becomes more personal preference, but is also somewhat dependent on the work you do in your office. If you're just doing general office productivity work, 4100K is a good choice. If you're doing color-correct work (like photo editing, printing, or other visual manipulation), you may want to go even cooler. Keep in mind, too, what surfaces the light is bouncing off of. If you have a cool light bouncing off a warm ceiling, it's going to change the light reflected to your work surface. If you have a white ceiling, the light will remain more or less unchanged.