Heat-seeking projectiles

I'm planning to make a robot who can launch missiles. Fyi, not actual missiles but small "missiles", plastic bits, maybe toothpicks, etc.I was planning for those "missiles" to be heat-seeking (I have a heat sensor for my disposal), so how do I make a heat tracking system for these projectiles?

 

You’re essentially making a

You’re essentially making a micro drone - you’ll need at least two control surfaces and actuators, optional propulsion, a 3D thermal sensor, a microcontroller to interpret the sensor data, a main battery and quite a bit of programming since the tracking needs to be done in real time and really fast.

Do you want to make missiles

Do you want to make missiles that fly like Cbenson said or toothpick like projectiles that are launched towards a heat source. The first one might get too big for your project and also quite expensive since you need the tech for every missile. Also how far should they fly ? But a very interesting project …

It’s gonna be toothpick-like

It’s gonna be toothpick-like projectiles that fly towards a heat source, or are television guided.