I have played most cRPGs on the market, but have never player a TTRPG before. I've been reading and watching a lot about D&D 5e for quite some time now, so I think I have a decent grasp of the rules and style of play I'd enjoy (low magic, realistic, living world). I've bought the Starter Pack and some additional things (like card packs for specific classes and dice) to make it easier for everyone. I'm planning on introducing 4-5 gamer friends to TTRPGs via D&D 5e in a couple of weeks and am planning on doing a Session 0 in order to hopefully get everyone on the same page. Everyone is a gamer in one way or another. For the past 3-4 years we've played many different board games (including Descent and Gloomhaven) together.
My question is mostly aimed at two of the players, who I fear will have trouble differentiating TTRPGs from games like Diablo and other, D&D-like cRPGs. I don't have very high RP expectations from anyone, but I fear the pair will push the whole group into the murder hobo style, completely bypassing many social encounters/options. The other problem I'm fearing is the 'kill and loot' style of video games. If they kill 10 goblins, they will expect to loot 10 short swords and bows to sell them in town later. While I understand there are weight restrictions, I'm looking for some tips to avoid such mentality in the first place.
One of the players also remarked, in response to my suggestion that everyone should pick a pre-made character for our first couple of sessions, that he wouldn't mind playing a Fighter as I can just give him some 'fireball throwing-item', which makes little sense.
I would rather he just play a Wizard then, but that might lead to the party being 3 Wizards and a Rogue (since Wizard sounds cool and Fighter somehow sounds boring). When only 3 players will be present, that might mean I will have to run the game for a party of 3 Wizards, which will be extremely hard for them, since they are completely new to the game and will start at level 1 in Lost Mine of Phandelver. I am also very much against constant waiting around and long resting, which is a common "tactic" in cRPGs, but completely unrealistic in D&D.
How do I transition these sorts of players into the low magic, more diplomatic D&D mentality for LMoP? Am I thinking like a bad, stubborn DM?
I'm looking for DM pointers an upcoming Session 0 about how to reconcile player's Diablo/cRPG-like mentality/expectations and get them more in line with the modern D&D style, without sounding like "my way or the highway".
We are all first timers, players and DM (me) alike.
Note: I've checked for similar questions, but I can't find any.