For number 1 You would def wanna start with Conquest
As for minions They hit A LOT harder than the creeps in LoL so watch out, they are the biggest threat to you early in the game.
You will always get EXP and GOLD from minions when you're close if they die
MELEE minions give 65 EXP and 17 GOLD BUT if you last hit them they give 25 GOLD
RANGER minions give 45 EXP and 12 GOLD and 18 GOLD on a last hit
BRUTE minions give the same GOLD and EXP as the MELEE minions but have almost double the amount of HP and deal A LOT more DMG
Also if a Phoenix is down you'll get Fire minions which have double HP and deal double DMG.
As for number 3 you could try the gods out in Jungle Practice, where you have access to all gods.
Be sure to read up on the abilities look up guides on the gods and you'll get the hang of em soon enough.
As for builds I usually look at Smitejunkies
, but I usually build my own builds to tackle the situation i'm in.
So be sure to learn what every item does as soon as you can and which item counters which god.
Dukesloth is a good youtuber/streamer to learn from as he does a lot of item and build analysis outside of that you can maybe watch some of the Pro players like Adapting for example. Oh Shale also has a small amount of really good god guide vids.
As for the entertaining youtubers/streamers we have A LOT of people. First off one of the inbetweens, he is entertaining but also an amazing player Sexsi Rexsi He is grandmaster in Duels and prolly one of the best Ullr's i've ever seen (Ullr being the hardest god in the game to play at a high lvl) and he's also very entertaining to watch.
Other than him you have: Incon, MaxTooTheLimit, InnocentRabbit, Kevox, MythyMoo and Punk Duck and a lot of others but I can't name them all.
And the last thing, no Smite has no Runes or Masteries.
It has no summoner spells either instead we have relics which are kinda like summoner spells, but you choose 1 at LVL 1 and you get the second one at lvl 12