Frankly? This kind of stuff is suitable for a pre-teen bedroom at best. X-mas present stuff.
a) I would never buy a separate amp with passive speakers anymore these days. Active speakers are so much easier.
b) Typically PA speakers will be 8 Ohm. This means you will get only 200W (and I hope per channel). Preferably you want the speaker to be LOWER than the amp. If you run the amp too hot (because you think your speakers can handle more), it will start distorting and clipping which can ruin your speakers even if they are higher power.
c) When you buy speakers, make sure that the rated power is in RMS, not Music Power, PMPO or other fancy marketing blah
d) Personally I think this gear is not worth any money. Even at 70 bucks it will turn out a disappointment.
e) Final word. The SN-ratio is 75dB. A decent amp will be in the high 90s or even 100s. Now you may say from 75 to 100 is only 25% “better”. Unfortunately dB is a logaritmic scale. So this would be more like a 9 times better!
Hope that helps some.