Show recipes ingame, using hotkeys "r" and "u" and search for recipes when in the inventory "e".
Fell trees, just destroy a block of a tree and the part above should come down too.
Type in the modpack name (nativePlusPlus) or paste the following url into the search box.
Finally, click Install at the bottom right of the launcher after you select nativePlusPlus from the list on the left. The launcher will handle everything else!