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The front left section of my frame is bent where the bumper attaches. What are my options for straightening?

Heat and a jack. Weld a plate or bar across the frame horns that are at the correct width, then place a bottle jack inside the end of the frame horns and gently jack the ends apart keeping an eye on the distance and how it is straightning.
This works great if the frame is stripped of all parts and stood on it's side. If this is not an option, you can use a port-a-power to jack out the ends of the frame.
Welding a bar on the frame where it is straight will keep that part of the frame from opening up any wider and you can control what part of the frame you move.

Just my .02 cents worth.

Just another more expensive idea...

Find a truck frame shop. We have a local company that repairs the frames on the big trucks. They can also do little trucks. Their straightening equipment is computerized so it is very accurate.

Or the cheapest route put out an advertisement in Supply Line in the MVPA. Lots of original replacement frames are out there waiting to be reused.

I hope that helps.