<p>Ok I’m so new at Blender. Half the time it’s knowing what question you have to ask to get the answer you need...</p>
<p>I want to make a 3D printable warrior type action figure but I only have one very detailed frontal view. Can I input that image into somewhere and it gives me a 3D model to start from? Like will it generate a 360 view? I have no idea where to start.</p>

In short, no. A 2D image has insufficient information to determine a 3D form.
If you want to do this yourself, what you could do is start with the 2D outline in a program like Blender (as 0scar mentioned in a comment), extrude it to make a thin "cardboard cutout", then begin shaping it into three dimensions from there. Imagine it like cutting a slab of Play-doh with a cookie cutter matching your 2D outline, then using the picture and your imagination as a guide to form it into 3D. I'm not sure whether something like that makes any more sense than just starting from scratch modeling it.
Alternatively, nowadays there
might
be some "AI" models to produce a reasonable guess at what 3D structure you want, with the knowledge that it's supposed to be a person, for a 2D image you provide. I'm not sure if there's anything yet of usable quality, but it's something you could look for.