Please don't take any previous response as a personal insult.
Unfortunately, many owners do make a 'spur of the moment' decision that it would be 'fun' to let their birds breed, and then find themselves in difficulty later - When members respond to posts on this site, the comments are as much for other people viewing the thread, as for the member who made the post. It's important that background knowledge and general experience (every good breeder has a first time) is made clear in order to not encourage ill-prepared actions in others.
If you haven't already done so, please DO read through the relevant stickies in this list first (other members' breeding journal threads may also help) to check your knowledge, as although you may FEEL well prepared there is a lot of misinformation on the internet. Please note that these stickies on the subject of breeding are only the basics! They are there in order to give your research a starting point.
Other members may comment with helpful tips and further questions for you. I personally know very little about breeding, though sometimes it simply seems that the birds 'aren't interested in each other in that way'.
The only thoughts I had that you hadn't mentioned were having wood for your hen to gnaw (she would naturally gnaw a tree hollow to suit her pleasing) and bathing. Budgies naturally breed in the rainy season so spray baths may help encourage them. *Though if these two suggestions are new ideas for you, then I feel that your knowledge is nowhere near as complete as it ought to be and strongly urge you to postpone your plans.
Think very carefully before taking this step.