Vamana

You can lane Vamana with a carry, mage, jungler(that means you're solo) or a tank, but i dont recomend a tank, because vamana full dmg is too sqishy for me. Vamana does not have good cc, but if your frend is in danger, you just ulty they're faces and try to scare them away or even kill them.
For clearing minions i use my 3 and try too hit them all with my 2, but when you have finished your tabi and voidblade in two hits with your 3, archers are dead and mele minions are realy low hp.
Fighting with vamana : i try to hit my 3 for the slow, then use my 2 and basic attack, they wont die if they are full hp but you can use your 1 and knock them up gaining time to damage them. If you try to use your ulty, i recomend sprint so your basic attacks dont slow you and you can always hit the enemy, or use your ulty in team fights so you suck up all the damage and your team mates or you can kill them.