First of all, bless you because we need more guys to show off what they're packing.
Second of all, I've definitely taken this journey! I love to show off, and I have learned a good bit about how to do it. I think the main thing that makes a difference is the underwear and the pants/shorts you choose. Even guys with small cocks can sport a bulge in the right clothes. Guys like me with big cocks can really sport a bulge.
It first off depends on what your cock is like flaccid. For me, I have a very long flaccid cock (5-6.5"), so I prefer to show bulge by wearing roomy underwear (I find Saxx and Andrew Christian to be the best) and shorts or pants without excess crotch space, but still enough room for everything to sit comfortably. So my cock sort of snakes down my leg a bit, and in certain shorts/pants, it's pretty obvious. What you don't want is underwear or pants that are so tight that they crush everything. That might show a bulge, but it will be uncomfortable and probably a smaller bulge that you want. Commando is an option, but you do risk being a little overly vulgar as this can show the outline or your penis and the head very clearly. But if that's what you're going for, by all means, do it! I would advise trying on a variety of shorts/pants in stores to see which ones show your bulge off the way you want. This could take quite a while, but it will be worth the effort.
If you're cock does not hang low like mine, I'm not as certain what to advise, but you might want underwear that pushes everything up, thus making your cock stick out more. I think the shorts/pants situation would still be safe.
Another option is just wear sweatpants. Hard to hide a meat sword in sweatpants.