Sorry Northchiel, on the Beeb boards I used to be able to check out each boarder before answering by looking at their previous posts and form a view as to whether they were a newbie or experienced. 
The ideal fertilizer is a specific bulb fertilizer, which has more phosphorus than nitrogen or potassium, typically an NPK ratio such as 5:10:5. But it is expensive stuff. Miraclegro and Phostrogen are the two main liquid fertilizers, but their NPK balance is the opposite way round, such as 12/6/12, to encourage leafy growth and flowers.
To be honest, I would use MiracleGro anyway. It is a lot cheaper than a special bulb fertilizer, even if some of the contents will be wasted.
PS: I tried to write 12/6/12 using colons and it comes out like this: 12
12, so colon 6 colon must produce this 12
12