Well hopefully as you say above your learned some things (about both fish keeping and posting in an online forum), so it should hopefully be an easier experience (for all) when going to other sub-forums. That said, not everything is cut and dried in this hobby and you will run into different opinions (probably just more so with Arowana, there is a lot of debate about best practices etc.).
Anyway besides stocking, as other have mentioned I'd be equally if not more concerned about filtration set up and learning about the nitrogen cycle etc. Good travels to your new tank, it will be an exciting day when that arrives.