There is only one canon technique for Steel release, nobody needs to teach you one technique it would be a waste of time. I believe you only need to fit the requirements for the Steel Bio and make it and then you're golden.
As far as Steel Release customs, since the element is very vague in its developement you need to be careful.
However based on your relatively low rank, you won't be able to make a Steel Bio just yet, you'll need ot master Earth and Fire release, which you'll only be capable of doing at S-class rank.
Also future questions that are this easy don't require a thread, you could ask a sensei or an RP mod through vms, they're more than helpful with basic questions like this. ^^