Good sets you've picked to start again wirh man, I've got the van in Lego and the race truck in Lepin enjoyed them both.

The instructions for the big lorry I'm building are made by a bloke named Lucio and if you youtube Lucio Tractor Truck itll also have links to where you can buy instructions. IMO don't entertains any thoughts of building it lol not untill you have a rediculous amount of spare parts. As to start from scratch it'd cost you thousands in parts man it is absolutly rediculous and I couldn't even guess how many I've used, I will try and find out

The power and pneumatic functions you'll get your head around the more you build again some are simple and some are very complicated.

Here's where I'm at on the build so far and waktimgbgor some more parts to arrive lol