Biggoron's Sword Guide1) Talk to Anju (Cucco lady) as an adult to get an egg
2) Wait for the egg to hatch (use the Sun's Song)
3) Use the newly hatched Cucco to wake up Talon (who is sleeping in the first house you come to when you enter Kakariko)
4) Talk to Anju again to retrieve Cojiro the blue Cucco
5) Enter the Lost Woods from Kokiri Village and then take the left tunnel...You'll see the creepy guy from Kakariko sitting by the stump...Wake him up with Cojiro
6) The man will give you a mushroom, which you must quickly (you are timed) take to the potion lady in Kakariko (must use cucco to jump over fence near the windmill)
7) You will receive a potion to take back to the man (not timed)...However, when you return, the man will be gone and a Kokiri will be there instead...
After bitching you out, she'll take the mushroom potion and give you the Poacher's Saw.
9) Take the saw to the Head Carpenter who is on the other side of the bridge in Gerudo Valley...You'll receive the Broken Goron's Sword
10) Time to go to Death Mountain Trail...Head up to the top to find Biggoron...You can't miss him...He'll give you a Prescription...
11) Take the Prescription to King Zora (who needs to be unthawed with Blue Flame you can get in the Ice Cavern)...He'll send you on another timed trade with an Eyeball Frog
12) If you get to Lake Hylia in time, you can talk to the Doc for some Eyedrops...Of course, this is another timed quest, so make your way up to Death Mountain Trail again to Biggoron (using Epona is recommended, of course)
13) Biggoron will be happy and will make your sword...It will take 3 days and nights though...
As for being able to understand the Gossip Stones, you must have the Mask of Truth...To get this mask, you complete the sale of every other mask...