Ok ok, listen, to make lets say a sword +1, you need 2 other +1 swords doesnt have to be the same like lets say you have 2 plus 1 fire swords, put those together with lets say a peace sword, dun dun dunnnn +1 peace sword.
to make items + 1 u need ur Normal sword no + and then u need 2 swords +1
u go to market and put Ur non + sword in big indow and other 2 +1 sword is small windows and u have +1 sword
to make +2 u need ur Normal sword +1 and again 2 +1 swords and u do same u go to market etc.....
to make +3 u need ur sowrd +2 and 2 +2 swords now u need to follow again how to make +1 and +2 ;P i hope understand now.