Building a team lineup

Most teams are mostly belong to these types;
Ganking lineup – excel in Lane control and pressuring the enemy
Pushing lineup – consist of plenty of heals and pushing
Turtling lineup – rely heavily on a heavy carry to win the game
AOE lineup – heroes which can dish out a lot of AOE(Area of Effect) damage

There is no definite best or worst team lineup, each of them has their pro’s and con’s. It's all depend on opponent team lineup too.
Mixture of each types may also work.

Lane Synergy – how should your lane be like
A normal lane should consist of 2 top 1 middle 2 bottom.
The safe lane, middle lane and long lane.

The ideal lineup
Safelane - babysitter and a late carry
Middle – semicarry /ganker heroes which can help a lot by reaching lvl 6 or 7 as soon as possible (defiler/thunder)
Long lane – tanks or gankers, heroes that have strong lane dominance

Misc
A roamer hero – which does not has a lane, but moves up and down ganking/helping other lanes which always is stunner.
A jungler – hero which enter’s the forest at level 1 allowing two solo’s
A lurer – someone which just lure’s creeps nonstop and almost never enter’s the lane. Must have excellent luring skills.
Dual-mid – some team put their heavy carry and babysitter / two stunner or disabler to press down the mid solo ( normally used against strong midgame heroes example SoulStealer, Thunderbringer)