My first time out was my freshmen year in high school and I just hoped on my bike with a can and a marker and just wrote on any and everything that I saw when no one was around. It was at like maybe 3 in the afternoon? Who pays attention to a 15 YO kid on a bike at 3pm lol
I started getting smarter and just ordering hella stickers and doing mad throwies on em and characters and just slapping those all over the place when I walked to school and to the bus among other things.
Don't try to be sneaky just be normal and inconspicuous. I did throwys after almost a year of bombing, take your time don't rush into it. It takes time do develop speed and a unique style.
Ohhh and dont take stickers or anything with your tag on it when you go out bombing with cans. Keep your name away from materials ;D