[HELP]Manual/Auto Inject option

I want to add a manual and auto inject option but idk the code since im a noob ... Can anyone give me a source or tutorial?

use a timer
and use system pause/pause thingi


and let the user decide how long that pause should be.

For auto use a timer to detect if the process is running yet and when the process is found to be running stop the timer and call your inject function. And for manual just check to see if the process is running and if so call your inject function.