At the start of a game I put a point into W, i do this because it's kindred's longest lasting ability to use early game. Using W on your first camp helps doing damage in between every AA with wolf attacking the camp inside of W (Wolf's Frenzy). I usually activate W at 1:35 in the game. Wolf's Frenzy lasts about 8.5 seconds and because of that i activate it 5 seconds before the camp spawns so that for 3.5 seconds Wolf can help me damage my first camp. The main reason i do this is so while i'm finishing off the first camp my W will be on cooldown for less time while i clear camp one and move over to either Red or Blue buff which your W should then be up in the next few seconds.

As you should know, Getting marks as Kindred helps her scaling in-game, the more marks you have, the more damage you do. The first mark can spawn in 1 of 3 places:

It can spawn on:
Top Scuttle
Bot Scuttle
Enemy Raptors

Your marks will spawn on these 3 camps/creeps randomly until you've collected 3 marks

Once you've collected 3 marks as Kindred, i believe this is the time where you're somewhat prepared to be in fights, i don't exclude fighting before getting 3 marks but i do focus on my first 3 marks before i'm really "set" per se.

Having 3 marks will then cause the mark to spawn deeper in the enemy jungle, while i'm not too familiarized with what it can spawn on (Which i believe is everything but the previous mark locations) i do know that once you've collected 6 marks, the marks will no longer spawn on jungle camps. Instead, the marks will start to spawn on Baron(s) and Dragon(s.

Beyond 6 marks (which should be past laning phase) you'll want to start focusing your marks on champions even more and try predict who's the easiest to catch out or who you want to focus and can take down easily.

I believe that Kindred needs this mastery, especially if you're new to Kindred. Kindred does not have much health scaling at all, and it is expected as she's and ADC Jungler in Design, so she's squishy. Using strength of the ages will keep you in fights a bit more with the extra health.

Buying Trinity Force late game will give you an extra 250HP if you're still not happy with having just over 2,000HP.

While you can use the Fervor of Battle mastery, i only recommend it to those who are experienced ADC's. As i'm not an ADC and never have been, i've never been used to playing with under 1,500 health for most of the game.

Sadly, strength of the Ages will be called Colossus of the Ages in the future and will no longer give you an extra 300HP after killing enough epic monsters.
To understand more about the future change i recommend watching this video:
https://www.youtube.com/watch?v=cHZYPyTCjZE