Full Short guide.
If you dont have the mid game items till the 20 min mark you would be in a lot of trouble.
Try to build it in 15 mins.
This is the item order I prefer:
1) Complete Magic Wand.
2) Complete Phase boots.
3) Complete Maelstrom.
4) Buy a Moonshard 1st if you are having trouble farming quickly and then immediately buy a Crystalys and the carry on with your Mojlnir.
5) If you complete the mid game items in 20 min mark you should have no problem ganking other heroes and winning team fights but if you didn't complete the mid game build around 20 min mark, buy Ring of tarrasque and Vitality booster (after the crystalys).
6) complete your Daedalus later 1st complete your tarrasque if you are behind schedule.
7) Last thing you wanna build is the Hurricane Pike.