Vi lethality is a harder build to do but once you get it down you can manhandle the game.

Start by clearing your Blue, you will find Vi's mana capacity is small for early game but getting blue makes it easier for clearing after first buff. You can go for your bot jgif its red and you have bot lane coming to leash but i find it easy to solo the buffs level 1 if you use a potion

After blue, kill your next jg camp and then go grab scuttle. save smite for scuttle if you can so dont worry about using your potions to survive your first 2 jungle camps if NEEDED.

Pay attention to lanes when you can while getting to level 3.

Half health enemies at this point are your best bet so you can either go for the easy " Q charge - flash - land Q - auto attack - E - Auto attack - E" Combo. Genereally you hit this combo fast enough to land at least the auto attack and 1 E and then they will flash if they haven't died.

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Uou can farm til level 6 and get the GAREN-TEED gank kill with the same combo as above followed by the Ult (R).

NOTE: if they have flash (should pay attention for pings from players if they got the enemy champ to flash beforehand ) SAVE YOUR ULT FOR AFTER THE FLASH

This will allow your Ally Laner to get back into the engage.

This is where paying attention to all lanes and enemy jungle patterns.

If you find the enemy jungler in the same lane as you a lot, get your first round of items (full AD jg item and boots) and switch it up.

DO NOT be afraid to counter jungle with this build once you get the first lethality item. Your damage gets crazy here. Just make sure to have a ward or control ward with you handy so you can prevent getting caught.

Control wards are better just in case they already have paths warded

Your damage starts to plateau after you get 2 lethality items and a black cleaver or steraks gage, Thats where you are normally dominating by killing roamers and getting good ganks in.

I want to go in more depth but dont have the time but i can summarize Vi' late game and mid game easy

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MID GAME

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3 ways it goes:
1) You get fed from ganks and carry the game by killing a laner and then damaging the tower
2) You are moderatley scaling by farming with unsuccesful ganks so you manage to engage adn do fair damage for your team to finish or push hard
3) you get countered hard and barely scrap enough gold to support the team and cant gank so you become more of a support jg then an assassin.

At this point you need to look at your optional Items and figure out what you need and to also think about your role in the game and what you can do to carry the game or to support as much as possible.

Generally you peak at 3 items plus boots and how fast you get there determines your lte game . play smart and dont engage without knowing the enemy. 1v1's will be easy unless they are fed or have a superior damage build