Need new wheels 622 15c shimano currently

Hi guys, I'm fairly new to road bike stuff.
Got trek 7.2 with shimano rs010 622 15c with pretty worn rims from braking but also had rear spokes go twice and with my lbs charging 30 quid to change spoke I was gonna upgrade wheels.
I'm around 17.5 stone.
Current rear wheel has fairly new 8 speed shimano gs cassette.
I don't have a cassette tool.
What's easiest option to get back on the road?
New wheels with cassette installed, wheels and cassette tool.
Cheers

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