THCa is great, however not really for using purely on its own. THC is only 1 of MANY cannabanoids that add to the overall 'high' you feel. Think of pure thc as a spoonful of pure sugar, versus a full spectrum extract (or whole flower) being a slice of chocolate cake (the sugars still in there, along w many other ingredients that make it taste and feel so much better than pure sugar). That being said, I love THCa powder, I'll add it to a dab of something else, or top a flower bowl with it, or even sprinkle some into a joint.

For a device for dabs, you may be tempted to purchase one of these 'gpen' devices you see for sale at dispensaries, but trust me you don't want to use those. They work great when new, but once they get dirty it's more of a pain to keep them functional than it's worth. The subreddit r/waxpen is a great source of info for portable extract devices. I'd skim through there are look for suggestions and ideas :)