Welcome Sanchez. Sorry you have reason to be here, but I'm sure you'll will get a lot of information and support from LCSC.
My wild guess is that the next steps will be a visit to an oncologist and, perhaps, a pulmonary specialist. He might have a pulmonary function test- this is really no big deal and takes about 10 - 20 min. Yes, the biopsy should tell what kind of lung cancer he is dealing with. That info. is necessary to develop a treatment plan. Depending on the location and size of the tumor and the type of cancer he might have surgery, chemotherapy, and/or radiation. If he has SCLC (small cell) you want to know if it's limited or extensive. If it's NSCLC (non-small cell)then you want to know the stage.
Even though your Dad said "it doesn't look good," remember there are lots of things that can be done. Some people here have survived for a long, long time with advanced lung cancer.
Please let us know how he is doing, what his treatment plan will be, and how we can help you.
Muriel