A B73-800 is a longer aeroplane than a B73-700. They have slightly different flare techniques. The B737 can be flared slightly stonger but if you do the same with the B738 it'll be a firmer landing. Either way, the important thing is not to let the nose drop when you close the thrust levers; maintain the attitude you adopted at the entrance to the flare. The other important item, especially on the B738, is not to make a double flare. That will just increase the ROD of the gear and be even firmer.
At the beginning, the advice I read in earlier posts of starting to do things gently after 30' is sound. I'm assuming that in the early days you'll be landing on the longer runways in your network. As experince builds confidence and judgement you'll find that you will delay things by 10' or so. Try to be too chique in the beginning can be a real confidence and runway denter.