So many options, what to choose
The best home exercise equipment - competition kettlebells 8kg - 24kg
A decent trainer will be able to suggest a suitable weight for you. Don't assume really light because you're a beginner. Most ladies start on 8-16 kilos and men 16-32 kilos.
Where you start will depend on your training background, your goals and your natural ability.
There are lots of bells on the market. And, as with anything, going cheap is false economy.
You will knock them against the wall, drop them on the floor and probably each other. Cheap bells will be broken.
Go for cast iron. And if money permits go for competition, or pro grade bells.
I'm not suggesting you enter a competition, although there is certainly nothing stopping you, but competition bells are bigger.
They are all the same size in fact.
But being bigger means they are more stable and therefore you can use them for more exercises safely.
Elephant walks, renegade rows and bell push ups, to name but a few.