Car seat and Stroller

Charry β€’ Can't wait to meet my Greek/Hungarian-Filipino Baby Boy!
Hi ladies.. I got a question..
My husband's Aunt bought our baby a convertible car seat so now we are torn between buying just a stroller or still buy a travel system? Now, if we buy a stroller, I am not sure if I can put a newborn in there since it can't support his self specially the head. Also I thought about getting a head support for the baby if we just get a stroller so it will basically look like the pic underneath (it's not mine) I want to know your opinion cause I feel like buying a travel system is not practical at all. I am a FTM obviously..πŸ˜†
I would really appreciate your help.πŸ’™