nuke the legion and punch president Kimball right in the jaw then dance on death claws while eating bacon and playing football with liberty prime while listening to the team America theme song

I would probably join the NCR and get some training . Or die from exposure. Yeah I rhink I would die from exposure .

I would collect a lot of gun and found my own armory like the wheaton armory.
This will allow me later to become a famous gun dealer in the wasteland.

I'd either get a suit of power armor and become an almost invincible badass or die trying.

Head out find a few followers/companions and just travel the wasteland exploring/hunting gangs and raiders, having a little band of renegades would be cool.

Find a empty vault, close it, and clone myself like Gary.

I might probably stick with being a merchant and join a caravan company. That way, either I can die faster or be rich and alive in this god forsaken Fallout universe.......or I could always start my own raider group or join one, that is if they want a fat guy like me~