You already know the answer, the question is how to do it in a way that's not expensive and complicated. I'd recommend these:

https://www.amazon.com/Soundcraft-Notepad-5-Small-format-Analog-Console/dp/B075SK443L/ref=sr_1_2_sspa
Soundcraft's notepad mixer line is a low-cost, high-quality analog mixer. I use the biggest-brother of this model and like it very much. This smallest one has the inputs you need, plus some goodies for as you grow--it's also a USB audio device, so you can route straight into your computer to record, when you inevitably decide you're going to want to do that. Once you learn it, it's not complicated anymore. $109

https://www.amazon.com/Behringer-Ultravoice-Dynamic-Microphone-Cardioid/dp/B0002KZAKS/ref=sxin_4_ac_d_rm
This Behringer microphone isn't going to win any awards, but it's cheap and fine. I use this very model with my band when we're on the road because they hold up to all manner of abuse and are cheap to replace and sound fine. $23

https://www.amazon.com/AmazonBasics-Tripod-Boom-Microphone-Stand/dp/B019NY2PKG
I like the Amazon Basics tripod mic stand. Again, there are way more expensive and "better" ones out there, but this one's cheap and fine. I like a boom stand rather than a straight one because it's much more flexible. $20

https://www.amazon.com/AmazonBasics-Male-Female-Microphone-Cable/dp/B01JNLUMMW/ref=sr_1_1_sspa
You'll need a mic cable. Again, Amazon Basics for the win. You want more length than you think you need, because eventually you'll find a way to need it. $11

So this complete shopping list is $163 plus tax.

Incidentally, it's a true fact about beginning musicians that one way to make sure you don't give it up is to put some money into gear. You can hold that investment over your own head when you don't feel like practicing. Little top-tip from a pro there. ;)