Safety first when dealing with molten lead. Use a well-ventilated area (preferably outside, don't breathe the smoke), face shield or goggles, and leather gloves. I use an old stainless steel cookpot to melt the lead. Any water in the lead can cause a catastrophic steam explosion and scatter molten lead around. Beware of a live round in range scrap that can do the same thing. Any equipment once used for lead, such as spoons and melting pots, must never be used for food preparation ever again.
If at all possible, try to get linotype, which is a eutectic alloy of 84-12-4 percentage lead-antimony-tin. It casts perfect bullets every time. I bought a hundred lbs at .50/lb some years ago and I use it to add tin to my bullet melt metal. You'll need about 1% tin to get good fill-out on your bullets. Linotype is too good for plinking bullets.
Buying lead from an indoor range is problematic. There's usually lots of target paper that burns up, bullet jackets, and crud mixed in that has to be scooped off the top after melting down. It's only a good deal if you get it free. I have to add some linotype for enough tin, since many commercial swaged bullets (like 22 RF) have little tin.
Wheelweights are good to use, you have to scoop off the steel clips and road grime when melting them down. A five gallon bucket is about 120 lbs worth. I add a bit of linotype to wheelweights for extra tin also. Make sure you flux enough to keep alloying elements from oxidizing out. I go around with a coffee can to various places and they'll give me a can full free "for making fishing weights."
I pour ingots into a Lyman ingot mould, which makes then about 1 to 1-1/2 lbs each.
Zinc or aluminum contamination will ruin your alloy--you'll never get good fill-out. Avoid wheel weights that are shiny bright with a rusted clip--they're probably made with zinc.
Don't forget the bullet lube. Lee liquid lube (which apparently is Alox 606-55 commercial rust preventative) works well for small batches. If you don't have a sizer, just cast and coat with Lee liquid lube, load to a midrange charge and shoot. I use 50-50 beeswax-Alox with a Lyman sizer. The cheapest I've found is Jake's, off ebay. I size 45ACP to .453, 38 and 357 bullets to .358.
Here's an online article you might find useful...
http://www.austinrifleclub.org/Documents/Articles/Bullet_Casting_Primer.pdf