I am not a working women at this time but when I was I kept it simple: Nice
comfortable pants and top must be pressed/no wrinkles. A light coat of makeup nothing too dark or over loaded and Lip Gloss.
Hair was always kept natural but well groomed.
The less time you spend on getting ready in the morning the better you will feel about going to work! But than maybe thats just me...
A good tip to nail: use rubbing alcohol to clean your nails before applying the polish. The rubbing alcohol remove all the the natural oils from the nail and allows the polish to stay on longer without having to touch them up as often.
If you dress comfortable but not sloppy you will be more comfortable in the work place. Nothing too revealing or loud prints.
Congrats on the new job !!