Congrats! I will comment on the plug and the kid.
1) In my response I am assuming the electrician meant a 50amp circuit when he said 50/220. I am not an electrician.
As you can see someone posted a picture of the two different types of 50 amp outlets here in the US. Unless I am mistaken code states that the outlet should be the 14-50 in this application. To be clear a 14-50 is not what you would have your dryer connected to. A dryer plug would be a 14-30 and would not be able to charge your vehicle safely above 24 amps. You should have a 14-50 outlet and you should verify this with your electrician and that he or she used the correct breaker and correct size wire. In order to comply with code the continuous load on a circuit cannot exceed 80% of the rating. So if you have a 50 amp breaker you can't go above 40 amps.
The 14-50 adapter is available from the Tesla shop and will allow you to charge at a maximum of 32 amp using the mobile charger that came with the car. The Model Y can charge at up to 48amp but to do that you need a 60 amp circuit. With a 50 amp circuit you max out at 40 amps.
Now based on what you said you should determine if you want to buy a dedicated charger. I probably would so that I could carry the mobile connector with me, however at 40 amps your not going to see a huge difference but if you do a lot of driving it may be worth it. The 2nd option is to have a 60amp circuit installed so that you can charge at the 48 amp maximum.
If it were me installing the dedicated charger I would go with a hardwired setup instead of plugging into an outlet. Code usually requires a GFCI type breaker and I have experienced nuisance tripping at one of my locations with the solution being switching to a hard wired setup. Also, I have read about multiple instances where folks had a defective plug or outlet which caused arcing and resulted in melting and burning. The outlet and plug are two additional failure points that aren't necessary if your installing a dedicated charger that you don't plan to move.
2) My teenager doesn't like the Tesla. She would rather I drive a pickup truck. I think kids don't like the attention being drawn to them or their parents..at least I think that is the case for me. I don't care though I love the Tesla and she will grow out of it