Screening questions can depend on the context more often than not. Some examples I can tend to use (I'm not an expert so maybe these aren't the best of the best)

• Crack jokes or make refrences that you find funny or that fit with your personality, if you have investment from her already, it should be easy to tell if she is into you/if your guy's personality types match up

• Keep the vibe playful while also interagting some sexual hints, if she rejects these or doesn't play along, maybe you need to either slow it down and build more investment or she's not into you

• Via text it's more difficult than on an dating app because on Tinder for example, it's obvoius that they want some sort of "realtionship", and they matched with you which shows SOME level of attraction so you might have to take it slower and develop a good deal of investment or more connection by talking on the phone, facetime or something like that

I'm new around here so I apologize if my advice isn't the most helpful or uselful but goodluck to you brother

there's two ways to screen. Explicitly, that would be something like "what are you looking for on here" i started to do that as my game got better. Implicitly is like sexual innuendos or inviting her straight to your place for a bottle of wine. Thats actually a very powerful one. Even if the conversation has not been sexualized at all, just the fact that shes coming straight to your place implies that sex is likely.