Hello, am new here. I’ve been watching speedruns for a long time and now it’s time to start running source games. I hope i can get somewhere someday!
Welcome! Just keep practicing and you will get the hang of it. 
Welcome to SourceRuns.
The best way to get started would be to watch some tutorials for the game you’d like to run.
Half-Life 2 New Engine tutorial by peroquenariz
tnks you guys! i’ll start as soon as i can tnks all !