what do i do after i build this tube amp?

http://www.tubedepot.com/diy-k-16lm.html

ok, so after i build this tube amp what do i need to do to use it with a guitar.

it has a rca input, so im guessing i would need to buy a 1/4 in female to rca male adapter. would this work?

also, do i need to buy a speaker. i have an old practice combo amp, can i use this amp to power that speaker? thanks a lot.
 
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