Independence is important.
There is no such thing as a common law marriage/wife/husband in the UK.
If you choose to get married, ensure your marriage is recognized in British law as well as in your religion.
How much does that (insert item of choice) matter cost? How much does it cost on a credit card? How much does it cost in hours of work?
These are the bills you have to pay to live, now put them in your own order of priority - rent/mortgage, savings for house deposit, gas, electricity, water, council tax, phone, broadband, food, clothing.
What other regular bills are you likely to have - pensions, subscription tv, car payment, insurance - phone/home/contents/car/appliance/pet/health, childcare, school fees, etc.
Personally, having done something similar, I’d ask them to imagine their dream lifestyle and then a reasonable/average lifestyle and everything that entails. Cost it out. Then compare it to the national average. Then consider careers that are likely to afford their chosen lifestyle.
Bear in mind that in my version, there was homework and we were able to discuss it afterwards in a second session.