Start with efficient speakers before you try the world of tubes which I do encourage.
Patience, wait until you find something that fits, used, near enough to go listen to 1st and pick up is my advice. Best way to save money, get something you know you like the sound of, and avoid shipping disaster.
Ask seller or look up the impedance/efficiency of the speakers he plays them thru, compare that to your speaker's efficiency, impedance.
Ask seller about spare and alternate tubes in the initial conversation, they might give you knowledge, perhaps include some other tubes, or sell them at good price.
Where do you live? I search hifishark, sort by 'first seen, new first', check every day until you get lucky, I just found something rare this am, just listed, made my offer, perhaps .....