Ken For beginners, I strongly recommend buying a 100W radio. Buying a high-power QRP radio could significantly discourage your interest in shortwave communication. Because beginners don't yet understand the principles of shortwave propagation, a powerful radio can quickly help you adapt to the shortwave environment, and then gradually transition from QRO to QRP. I do not recommend G90S, G90N, or X6100 for QRP operation. If your budget allows, there are still many options available.
8000-10000 RMB, FTDX10
6000-8000 IC7100 FT710 IC7300
4000-5000 FT891
1000-3000 IC718 (78) IC707 (77) IC725A
If you're looking for something under $1000, take a look at the Kenwood TKM707.
The above options represent QROs with a power output of at least 100W, and you can choose one that best suits your needs.
As for the antenna, either a 20m end-fed V750 or a 5.3m GP would be suitable.