Newbe with questions

Hello all my name is Josh and I am new to the Prius game. I just got a job that will require a lot of driving so fuel economy became key to me. I fought against the idea of the Prius for a long time, but I found one that was a deal I could not pass up and figured it was time to give in to my needs.

So I picked this 2007 Prius up with 156,000 mile from its original owner and that has been mainly dealer serviced its entire life for $2300 over the weekend. Yes it looks like it was punched in the nose and its even worse now, because the previous owner tried to drive it to a body shop without making the sure the hood was secured down. Unfortunately it flipped up and smashed the windshield. Any way I am now in a parts search and have found almost all I need except a few key parts. I am hoping that y'all can help point me in the right direction hear. I need the following part Coolant overflow bottle (not the whole fan assembly just the overflow),

Also some questions about options I want but don't have

Ipod USB connectivity, I found one or two systems that seem like they are plug and play, but what do you guys recommend??

Auto headlights, can they be added??

I thank you in advance for your help and I look forward to learning all I can