Plant bulbs 4" to 6" below ground level. Planting deeper is okay, shallower is risky, but an added layer of mulch works to remedy that. Fertilize with a full spectrum fertilizer to meet bulbs hearty appetites... if not now, be sure to fertilize in the spring just as the blooms are fading. Winter rains will likely meet the needs of necessary watering throughout the winter and spring months. If bulbs are containerized and/or under a covered area, they will need to be checked and watered monthly through winter.
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Bulbs that are to be planted in the fall months must then endure the winter season as they are growing, and thus must be planted at depths that provide a safe barrier from the freezing temperatures. Here in the Pacific Northwest we can safely plant bulbs 6" inches underground and that will protect them even if the temperatures dip into the teens (F) for a week. In our area, standing water is more of a concern than the cold temperatures as bulbs do not like wet feet for an extended period of time. Good drainage is important and is also something to keep in mind when planting these bulbs in containers as well -- excess water must be able to drain out of the bottom of each planter.
Bulbs prefer soil conditions with a neutral pH of 7.0. They can tolerate a little variance though. If you know that your soil has a lower pH, of say 5.5, then you would want to add lime to that area to help raise the pH to higher levels. Tulips in particular do not do well over an extended time if pH levels are low. The best time to add lime to your soil is in the fall. Work it into the soil where you will plant your bulbs. Follow the instructions on the bag of lime for desired results.
After your daffodils and tulips bloom it is best to pick off the dying flowers and discard them. This is for two reasons: 1) as the flower head withers and decays it tends to mold; when this happens, the mold spores fall onto the live and growing foliage which can then infect the rest of the plant which stops the growing cycle; 2) a seed pod is located just behind the flowerhead and if this is removed with the flower it allows all the energy of the plant to be put into the bulb and next years flower production.
Mice have a hearty appetite for tulip and crocus bulbs. And, with the help of a moles ability to dig through your freshly planted flower beds, the mice gain access to your bulbs. An alternative is to plant these bulbs in a container such as a pot or can, with holes in the bottom for drainage, and this will protect them from those types of pests. Deer are also a problem for tulip flowers once they have sprouted up, they like to eat the flowers right off at the ground. So keep that in mind. Daffodil bulbs are poisonous and are not bothered by rodents and animals.
