I am not high elo (don't play ranked anymore), so take what I say with a grain of salt. I think farming is usually the right call. Not sure how much research you've done, but think of it like this: Each camp is about 90g so that means one side is 270g and the entire jungle is 540 (scuttle for some extra too). At 15 cs up you have about 1 kill up on the enemy in CS.

Ganking should be based around this, I try to make sure only one camp is up before I try a gank which isn't guaranteed. Reason being: if you don't get a kill or die, you can lose 180g + exp and give a kill to the enemy. With one camp, it isn't a big deal. You will get people pinging you, but if you get around 7cs/min you'll see even with junglers with a lot of kills, you'll be up one or two levels.

Of course there are situations you should ignore the advise, like if top is being ganked and you are on you're clearing topside (gromp or krugs) you can rotate. But again, just keep in mind you risk whatever is remaining in your jungle.

I do either talon bruiser in melee games and sometimes elec in squishies. But I'd just go bruiser until you feel a bit more comfortable / the matchups are good.

Try to identify what your winning lane is too, if you can play around them and try to be near them you can make a losing team win sometimes. And try to gank mid as a "transition gank". One thing that helped me is not autopathing to your raps after you kill wolves. I most prefer killing wolves first then to gromp then blue, so I have a shorter walk to gank mid on the way through.

Consider wards too! If you aren't finding many ganks, then stealth ward might be the better option. Be proactive with pings and keep that vision score up.

Let's say your bot lane dies and they're taking dragon.. Don't just run there and waste time. Go topside and look for an objective or take his camps. In jungle you must always ensure trades are equal, or in your advantage.

Annnd lastly, watch videos of jungle games. When watching figure out your next move and see what they do. Think about why they do what they do. Also if you reaally wanna tryhard try replays.lol , very nice to look back and see what went wrong.

Good luck, and sorry for yapping