How to train?

Very first time grower here. Haven’t even tried my hand with any other plants before I am a bit nervous on how to low stress train the plant as I finally got them to grow straight is there anyone that could point me in the right direction maybe a guide a YouTube video or something that has good info I’m just really nervous to do the wrong thing and kill them.

When to start LST ? What materials will I need? Some people told me zip ties and others tell me a trellis netting I’m completely lost figured this is the best place to ask.