Another thing you may want to consider is old jewelry and even PC Parts. I say this as these can be an entry into the area without much cost. Some of the PC Parts you can find in roadside collects and you can get the parts you want quickly and easily right there and then. Take any power cables as well, just cut the ends, also of old TV's Washing Machines, TV's etc... This over a year may give you some extra items to sell to scrap like the copper from the cables
The old jewelry you need to know what you are doing and learn mintmarks but the Internet will give you most answers. By going to Garage Sales getting small bits here and there. I know some of my local Cashies have a 50% of sale and when they have not updated prices you can get pretty good deals. Depending on what you get you can do bulk trades for coins or bars as you get more.
Hope that gives you another thought, just check the details of the council in your area about taking stuff, you want to make sure you are not breaking any laws, then learn on the jewelry and you could be surprised what you find. Just keep an eye out.