Used Yaris Only Came With One Key...

[ShadowRabbit]

Hello. I'm new to posting here, and I'm sorry if my search-fu is weak. I'm trying to learn things more or less on my own and I'm a little stuck.

I got a used 2008 Yaris sedan last year, and the dealer said they only had one key. It's not even a Toyota key. It says Axxess+ 35R and has no fob or anything. I'm assuming it's a valet key as well since it doesn't open my trunk (I know, I did a bad job scoping things out before buying).

I've tried to do some research, and so far I'm gathering that I don't have an immobilizer because my ignition has no black ring and is all metal?

My first question is, will I be able to have a key with the fob buttons at all?

Second, am I pretty screwed when it comes to getting a new key? Is this one of those things where I will need a new ECM and am I forced to go to a Toyota dealer to handle this?

I'm just trying to educate myself on my options here and I don't have any knowledgeable folks around me right now, so any pointing in the right direction is appreciated. I am happy to learn. Thank you, all!