Aim for 1-drops because otherwise you won't have anything to play on turn 1. Vs aggressive decks Mistress of Mixtures and Holy Smite are good, and Reno Jackson is better in your hand than at the bottom of the deck. Remove Tinkmaster Overspark because it is Not His Time Yet and the temptation to play him to pray for a 1/1 may lose you the game. Vs control decks do whatever the hell you want because you're going to be here for a while.
If you are playing against an aggressive deck, play Mistress of Mixtures. If you are playing against a control deck, you can end turn. This will be good practice for the rest of the game.
The Rest of the Game
Vs aggressive decks, attempt to field face damage using a mixture of minions like Mistress of Mixtures and Kabal Talonpriest, and spells like Holy Smite and Shadow Word: Pain. Then play Reno Jackson on turn 6 and hope that counts as stabilising. In the midgame, Raza the Chained is a good card for Not Dying, which is key to this deck. Idk whether to use Shadowform as earlygame ping or not - on one hand it helps deal with the board but on the other it removes heals. General rule of thumb is don't use Shadowform if your hero power costs mana.
Vs control decks you generally hero power and pass forever. Kill your opponent's minions if they play them but they might not. Try to play stuff if you have 10 cards in your hand because otherwise you will burn a card on your next turn. By the end of the game, play N'Zoth, the Corruptor when your opponent seems to have run out of resources because then they will be like 'oh no I have run out of resources' and you will be like 'haha look at these things that you could use resources on if you had them but you don't because you have run out of resources'. When playing Kazakus, try to play him with Brann Bronzebeard, and aim to get potions that resurrect friendly minions. This may not be what you want but if you don't do this you will be going against the name of the deck, so please be considerate. Remember that if you have too many cards in your hand when you play Kazakus and Brann you might end up burning stuff which is generally considered Bad by most professional players.
Entomb your opponent's Reno Jackson*. I know that Ragnaros the Firelord looks tempting but you must stay strong**. Don't entomb your opponent's Reno Jackson if you desperately need to Raza or Kazakus and you haven't drawn Reno Jackson yet, not that I have done this before of course I am a professional Hearthstone player. Also don't entomb him if you are boring and just want to play optimally probably.
Somewhere along the line they will try to Leeroy Jenkins/Power Overwhelming you because they are desperate but you are on full health because you have been playing so well and then you emote 'well played' and win because also you entombed their Reno Jackson I guess.
Tinkmaster Overspark is in the deck because I got him and wanted to use him, also he is good for dealing with Ragnaros and Sylvanas Windrunner which means you can save your entomb for their Reno. If they have more than one card on the board when you play Tinkmaster then some people believe praying works.
You can use Bloodmage Thalnos instead of Loot Hoarder. I just don't because I made this deck before I had Bloodmage Thalnos and forgot to edit it. 2 attack is also better for trading so I will use that as my official excuse.
Tinkmaster Overspark can be replaced with Magma Rager if you'd like a more aggressively stated 3-drop.
You can put Doomsayer in for more ways of clearing the board and even less resurrect value.
*They will be playing Reno Jackson because it is the only control deck that exists.
**Don't look at Sylvanas. You don't need her.