Interface to KNX and the rest - looking for something like a starter kit

Hi , I will be doing a smart building installation in a holiday home over the summer , I have an Ets3 Lite and would like to do some training . What do you recommend for a starter kit , I am interested in the interface , actor and button . I've dwindled a similar topic on the forum but nothing came of it .
Greetings ,
Czarek