I have watched a couple videos on making coal loads and it doesn't seem too complicated so think I'll give it a try.
Any suggestions on what coal to buy, is it all the same ? Where to get it ?
It's not complicated and an easy DIY - the blue foam method works just fine and you can make whatever customized loads to suit whatever car you have in hand.
Here's one of my gons with a real coal load that I sold off in April.