Not a guide in general, but I like to advise you to take a look at the good old methods to gain money, after all the vendor trading,
On my server many items are stable with their prices for now.
So simple trading and flipping startet for me and im happy for this.
And with the market system it works like a charm, much better than all AH trading I have done in other games.
I can simply buy or sell to every time, only make buyorders ond sellorders.
I think vendor crafting is allmost over. (For my server i'm really sure of it)
If you want to try start slow may farm some plat (3-4) before, since you can continue trading, if your sellorders won't buy, like no one has much need for Runes since 2-3 days.
Whatch on the market (whould advise 1-2 weeks), if you see it's stable, try it.
But be carefully, the prices can drop every moment and never go back. In the beginning nearly everyone make loss. Someone earlier, others later. You have to put loses for some items into your calculations!
And don't give up early, it's the best and fastest way i think, but a bit difficult at the beginning.
In additional you can start to flip items and raise the prices up to double or tripple. Or my favorite: "Buy all you get of one item for a week or so, then the people get really need for it and think it's rar, so it can be possible to sell them for 1000%."
But swapping is really spekulativ and can gain a lot of plat or can ruin you
Last to say: It won't make sence to say you specific items, but the startegie should ever work, sometimes more sometimes less.
If i find some time for it i will make an addon with market statistik and post/buy at one click after setup it. Since no of the current addons fit for my wishes.
In special i whould like to set it up for more than one char with a total overview of all charakters, since 25 slots are to low!
I won't answer on the Pm's of people who want fast much plat!
And be fair open answers could help other people, and other experienced traders may have better advises then I could give you.
Hope this writing was not useless at all.