Personally, I think you can use 1 workbook. My workbook has 3 Lesson Practice, 3 Systematic Review, and 1 Application and Enrichment for each lesson. I’m currently in Alpha. My son is really good at the math so far, so he usually does 1 page of practice, and 1 Review page, and the Application and Enrichment page - which is often a word problem to figure out. You can go to the site and create more pages for practice if you need them. Start with 1 and see how it goes before you buy a second one.
As far as blocks, there was a free travel version linked on their Facebook page that I printed out and laminated. It’s working well so far for us. He does have some red blocks in 1’s, 10’s and hundred that we’ve used, but he usually uses nothing or the laminated blocks.