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The yellow is more than likely because the plant isn't getting enough light. You will need to find a way to give it stronger light for a longer duration.
Most well-known bulbs (tulips, daffodils, hyacinths, and crocues [corms]) need at least six hours of natural sunlight daily in order to do well. Under artificial light, they will need for the light to be closer to them and to be exposed to them much longer.
If, after you've given your plants adequate light, the plant remains yellow, then you'll need to see if you might have given it too much (or too little) fertilizer. Usually bulbs don't need very much fertilizer, if at all.

There are many reasons why this could be the case. This article will give you a good rundown on what is going on: https://www.gardeningknowhow.com/ornamental/bulbs/tulips/tulips-bloom-every-year.htm

*sprouts in the spring, not winter

You will have to be careful and make sure not to disturb the roots. Carefully turn the pot upside down with your hand over the opening. This will get the whole thing out in one piece with a little wiggling, or tapping on the pot.

Dig a hole slightly bigger than the mass of roots and dirt. Place it in the hole and cover with soil. Water in immediately, then add more soil if needed.

Here is an article that will help: https://www.gardeningknowhow.com/ornamental/bulbs/bgen/forcing-bulbs.htm

The bulbs need a chill of 35-50 degrees F to trigger the bulb to bloom. You have already had this. It is fine to pot them up in regular potting soil and bring them in the house to force an early bloom. After blooming, cut the bloom stem off and plant the bulbs in the soil in late spring to allow the leaves to rejuvenate the bulb and die back on their own. Bulbs are planted at a depth that is 3 times the length of the bulb. A lovely gift!

Yes, pot them up and put outside. They need 8-15 weeks of cold (35-50F) to trigger sprouting. I would let them bloom in the container and move the bulbs outside after the flowers fade.