a similar discussion you can find on following thread
since you want to prepare a lab for practice, in this case first question is, does the product work in evaluation mode, like ESXi and vCenter. I don't think vRA is available to evaluate directly to individual users as it is.
Try to explored hol.vmware.com for hosted evaluation and hands on exercises with quite nice documented tutorials.
I think you get Evaluation license entitlement as part of VMUG subscription for vRealize Automation, if you purchase it. please double check subscription cost and evaluation license included in it. This would help you to build vRA Home lab for practice.
and then if you are seeking step by step instruction to prepare this lab environment. Give it a go on google search and you will find many such nice articles written by various people, one of those is on following URL
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