Ren'Py Abandoned Lab Rats 2 [v0.51.1] [Vren]

[Fr34k0]

The game got a tutorial that you follow to get your first serums up and running so the way you describe the play tells me you never even tried to play this game. There is no one way to play just start the game follow what the tutorial tells you then do what you want from there on.
Make money and get all the girls for your harem that you want with or with out using any serums.

Tutorial: make serum.. profit.
is that a tutorial to you? Like I literally went with the introduction, went to the part where I see the Stephanie, then I'm lost cause it didn't mention anything or even show like "hey go here" like a normal tutorial

 

[Fr34k0]

If you want more guidance then the tutorial and in-game info give you I've written a couple guides and a week one walkthrough of sorts. They're posted in the OP

finally, thank you

 

[a1fox3]

Tutorial: make serum.. profit.
is that a tutorial to you? Like I literally went with the introduction, went to the part where I see the Stephanie, then I'm lost cause it didn't mention anything or even show like "hey go here" like a normal tutorial

You should have gone to the production room to finish up that part of the tutorial and then on to the office for the supply side.
It tells you in game what to do next but if you skip over it then that's on you.