you can find the number for the burs in the above links and as for specific diameters you can get them from brasseler website or any other company's bur catalogue.🙂
yes it should be ok,
you will know which brand they are selling anyway. I would recommend buying a good brand, I am not sure how the other cheaper alternatives would work out as I have no experience with them, I did however buy hand pieces from e-bay and they worked just fine (provided you don't use them on a dental chair set up they seem to go bust with higher air pressure) the home set up/practice in training centres is allright.