Hello Anastasia, I hope everything is fine with you my sister in the Lord. Please forgive me if my answer doesn´t address your question properly.
My personal advice on this, as I assume from reading some of your other posts, that your in process of meeting someone.
Keep a strong hold of your faith,with truth, openness and honesty on things, questions and matters that eventually will pop up.
You seem like a woman with a big heart, full of faith and love. Don´t let that be nr 2 when the questions on job, income, church attendance, fasting and tons of issues arise.
From personal experience, I always felt that the answers was at hand, I should do this Jovan, I should ask about this Jovan, I MUST ask of her view on this issue etc. The problem for me was that I never did anything of this, out fear for man and his judgement. If your opinion, in accordance with the church ( AND ofcourse spiritual guidance from your priest) is clear, than make that clear to him. If faith is nr 1 for you, make that clear to him at once.
You will know the shoulds in good time my dear sister. But the things that becomes optional is when we feel that the shoulds become hinders in the relationship.
One example I can come up with could be on confession. If you meet someone that goes to church, keeps with all the dates and celebrations but never makes confessions to the priest as well as receiving communion. That is totally optional on his own side, but for your sake, you know what the "should" should be for him in this case. That he should regard the sacraments as something to strengthen his relationship with God, and therefore in the long term with you. Keeping in on sins will affect people around him.
This was just an example, but the should always stands clear in something optional I think. If confession to priest doesn´t matter in a relationship, then someone within it will receive an entire confession before breaking up
Same goes with income, family, ethnicity. Is he rich and you poor. If that matters to him but you feel it optional, then it will become a problem sooner or later. The should is that it doesn´t matter
Forgive me for an bombastic respond, pray and forgive me sister. I pray that God richly guide you with all the shoulds and bless you into a wonderful journey