I admire your ambition. Sure you have enough room in a small greenhouse for thousands of bulbs? I guess you'll find out soon enough as your plan falls into place. (Obviously you know that you have to get a move on it as Easter approaches.... there's always mother's day I guess)

Timing and temperature control will probably be your biggest issue, knowing the exact variety will help, darwin mixed or pastel mixed isn't really enough info, especially if you just grabbed a couple bags of bulbs at Costco or sam's.

Here's a link for Easter forcing of precooled bulbs. Good luck!

.....Garden web is not accepting the link I added, you'll have to cut and paste....
http://www.netherlandbulb.com/index.cfm/fuseaction/home.showpage/pageID/121/index.htm

Good luck.

Here is a link that might be useful: Kato's bulb forcing link made clickable

Hi,I am in warmer zone than yours & weather has been warmer than usual even for my region ,I planted Darwin hybrid tulips Ollioules,Big chief on 19 th Nov last year in my yard & they are in full bloom now ,also the May flowering/single late tulips "renown" planted on 6th November are also starting to open in my garden , so I am guessing they take 4& half months in outside weather. since you are forcing them in warmer conditions, they'll probably bloom in 2-3 months after planting (my guess)