So you spawned and your main goal is to get Mithril. This guide if prefered to be read if you are getting the hang of the game.
1.) You spawned your first things to do is create a raft and get five stones and create a stone pickaxe ( If stones are present ), get two foliage,a rope, and create a flint while you are at it.
2.) Go to ore Island and mine yourself some Three copper, Seven Tin.
3.) Smelt the ores with your first foliage and create yourself a bronze pickaxe from your second Haft, and craft a tin bucket ( It would be important in the late stages of this guide ).
4.) Mine four coal and head to cliff island and mine four iron ores and craft them into steel.
5.) Smelt the steel with your second foliage and create yourself a steel pickaxe and a flint and steel ( Optional )
6.) Head to wheat island and eat the coconuts to refill some of your thirst and hunger.
7.) Head to desert and get yourself six cactus.
8.) Head to the arch and make yourself a platform to reach the mithril (Bring a second raft!)
9.) Mine the two Mithril Ore deposits and return back to wheat island.
10.) Smelt the the eight Mithril Ores with the foliage of the coconut trees, use the wood to make yourself two hafts and eat the coconuts.
And then your pretty much done to make the pickaxe and the sword.
OPTIONAL IF YOU WANT TO MASS PRODUCE MITHRIL
11.) Make yourself a Mill and harvest all wheat and create them into Wheat bundles get yourself a coconut or two and some foliages.
12.) Head to desert and plant the coconuts and make yourself a sandstone well ( Four sandstone + clay )
13.) Make a sandstone hut to store your mithril in the future
14.) Repeat #8-#10