Hey lunarman, t
here's not a lot of training you can do to get those long colas, what you've seen is a large part genetics. But even with good genetics, no plant can reach its full potential unless it is maintained in a favorable grow environment. There's no secret ingredient, it's not always easy, but it is fairly simple. You just pay attention to maintaining a balanced nutrient regimen (not to weak / not too strong - if you must err, go weak) within the desired pH range, do whatever it takes to maintain a healthy root zone, keep the room as close as possible to human comfort temps, and provide quality lighting to the plant canopy.
You mentioned some of the pic's you've seen have appeared to be well manicured while others were wild and leafy. That's mostly genetics, as some strains produce tons of leaf-to-bud ratio, while others seem to grow cola masses with very little leaf.
Photoperiods respond much better to pruning & autoflowers, for me anyway, respond better to low stress training. But this is more yield-influencing than appearance. And yes, light management is critical. Too little light and the plants will grow spindly plants with wispy buds. To an extent you can help this by moving the light closer. More intense light helps the buds to be much more dense, but too much light can vary from very dense and compact growth, to outright damage or bleaching of the colas nearest the light. You can help this by moving the light further away.
Tell us what you're doing today & maybe myself or others can make some suggestions for you.
What's your grow room environment? Closet, tent, micro, etc. Dirt? Hydro? Coco? Hempy? Temps maintained during lights on and off?
What's your nutrient regimen and feed methods? Additives? Are you monitoring ppm & pH religiously? There are differences depending upon grow medium.
What style, brand and power light are you using? There's tons of ongoing discussions on the best way to qualify lighting. The simplest (and possibly most subjective) is watts at the wall. There are tons of better technical descriptors than that, but none have industry standard qualifiers defined yet. So report what wattage your light consumes whether it's HID or LED.
The best advice I can give otherwise is don't be afraid to screw up. Mistakes teach better than successes.