Spend a lot of time at the Cast Boolits board
If you are running a 6-cavity .45 mold, you will need a 20-pound pot to feed it.
Give some thought as to how you want to lube your bullets. There are the traditional grease or wax type lubes which are applied by a bench top machine to grooves in the bullet. More recently the dip-type lubes have appeared, such as Lee Liquid Alox, which will work with traditional grooved designs, but designs made for use with it have very shallow grooves. The former are much more capital intensive. Setting up for lubing with Lee Liquid Alox is messy, but cheap.
I find it hard to believe that you can not find any Lead scrap. Most scrap yards will have cable sheathing and other Lead materials. Beware of wheelwrights, which used to be the primary source of Lead for most bullet casters, as most wheelwrights are now Zinc, and a small amount of Zinc will turn a large quantity of Lead into something the consistency of sand mixed with syrup. Leave car batteries alone: melting them can produce extremely poisonous gasses.
Bullets don't fill out well with just Lead. I add something like 2% Tin. Scrounging to find cheap sources of Tin will be difficult.
Pay a lot of attention to not poisoning yourself with Lead. Don't eat or smoke while casting, and after casting put your clothes in the wash and shower.
Before you buy a mold, slug your bore to see what your groove diameter is. Using a too small bullet will result in extensive Leading. I try to be .001" over groove diameter. Do not trust the book groove diameter, as they are frequently wrong. The book diameter for 9mm barrels is .356", yet I have a lot of Beretta and Walther 9mm barrels that are almost .358". My Colt Series 80 is right at .451", but an acquaintance measured his Taurus and says he found it to be .457"! To add just a bit more complication, some pistols have big groove diameters, but the chamber is cut so tight that it will not chamber a cartridge assembled with a big enough bullet: for these, you are stuck with jacketed.