Kailthir welcome aboard. Like Glenn said, visit some fleamarkets, yard sales and estate auctions. Old hammers, files, punches, chisels and other tools are abundant there and usually cheap. Especially if your going to be refacing the hammers to suit your needs anyway. For the files you'll want to get a file card to clean them.
Some tools in my opinion it just pays to buy new and quality, like the 4 1/2" grinder.
For the oil, you may want something with a lid so #1 you can close it if it lights up and #2 so you don't accidentally kick it over and have a oily mess to clean up or a potential spreading oil fire. I use a tall ammo can. Oh yeah. A fire extinguisher is good to have too.
As for the bolts I think most would be fine if they arnt right in the air grate.