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There is plenty of information in Altium Wiki Altium Wiki - Altium Wiki - The Altium Wiki I recommend visiting this site for any question.
Regarding multilayer PCB, basically when you are in the PCB editor go to Design >> Layer Stack Manager and then click Add Layer. After that you will be able to chose which layers you want to working on in the menu view configurations (Keyboard L). Otherwise it is a bit confusing to work with multiple internal layers.
A good recommendation is to use some internal layers as power planes. Note if you define power plane layers in Altium, they are negative masked layer, therefore if you trace a track it will be a copper free zone!
Thanks for replying. I refer in Altium Wiki and download some manuals. I also discovered Layer Stack Manager guide. But the information is not enough. I need some documentations with more details include: guidelines, tutorial guide,...
Thanks and Regards,