Is that all it is? I thought there was more to it. Haha
If you want to practice possibly one of the best ways is to get some vallejo primer (about £12 for 200ml, available in something like 12 colours last time I looked), as that is both something you'll be using and cheap enough to waste some
To give an idea of how far vellejo primer will go, from memory I used a fraction of one of the big bottles doing about 200 nids of various sizes.