Cheat Engine

[Dr.Disrespect]

For better explanation, I will use an example to illustrate my problem.
I want the following to happen:
1. I click to open my trainer.
2. A loading screen pops up with the text "The trainer is loading, please wait." The loading screen is another form I created in Lua script.
3. 5 seconds later, the loading screen disappears and my trainer shows up.

My problem is: the loading screen and trainer both show up at the same time after I click the trainer.exe. I have used

[STN]

Put in Sleep for 5 seconds. I don't know the lua command for sleep but it probably is sleep()