I'll deal with tulips but many bulbs being forced are dealt with by similar ways.
Into a 6" clay pot, put 6 good sized tulips bulbs which has had good topsoil put in to the top of the edge.....loosely.
Make a hole in the soil for the bulbs.....do not push the bulbs into the soil to make a hole----make the hole first. Then when the bulb goes in, it does not compress the soil under it which might affect the way the roots develop.
Put the flat side of a bulb near the edge of the pot. This allows the first of the leaves to form to grow outwards, not inwards where it might interfere with other foliage.
Water slowly but deep. This should then take the soil away from the edge and go deeper. Continued waterings will cause the soil to compress sufficient to allow further watering to be held.
Put the pots into the refrigerator....if you've got room in there or use an old fridge that maybe is sitting down in the basement or out in the garage. A functioning fridge has a temperature of 35 to 45 degrees F. (An unheated garage....in winter.....don't do it, they'll freeze for sure if you reside in anywhere but a zone 8 or better.
Bulbs must be allowed to be cool.....at these temperatures. They must or they wont develop their roots sufficient to grow foliage and bloom. Into the fridge or a coldcellar for 14 to 16 weeks. If you put them into a refrigerator prior to potting, then reduce the amount of weeks by 3 if they spend that any time more than that in the fridge.
They must be given this time to develop roots.
Then they are brought out into a sunny window where in about 3 weeks, they should come to bloom.
Watering.....of course, they are living plants and must be kept moist throughout the entire cooling period. When brought out, they are watered if needed and fertilized when foliage is growing, continued when blooming. Fertilizer speeds up bloom...thus it shortens bloom time. Sun....hastens growth and bloom....withdrawing sun slows down bloom. If the plant is blooming too fast, put it back into a cool area.
When the bloom is over and the garden soil can be worked, put the plant into your garden soil, allow the foliage to die back as usual and it will re-appear the next or the next spring.