To start off, a husband will come into a D/s relationship with expectations on the way it will go. It is important that these be ignored and replaced with teaching him to follow your expectations. To get there, it is important for you to first identify what you would like to see as expectations to have him meet.
Okay, so now you have a few ideas about what “you” want to see. Your husband has agreed to the D/s thing, but is holding on to his expectations. A good starting point is to ask him to not start any conversation with you by saying “how about if…” or “Do you want….”. This is really a way of him saying, “I want to…..”. Let him know that he will be given direction about what you want. If he breaches the rule, remind him. This will keep his own ideas bottled up and eventually he will develop the habit of looking to you for directions. It will also help you to stear things how you like without his prodding you. Learning to be a dominant takes as much time for you as he will need to learn to be a submissive in the day to day routine.
Thirdly, tease him sexually with him knowing he will not be getting an orgasm for awhile. Tell him maybe the weekend, but during the week, ask him to help you undress, or give you a full body massage, or give his ass a good pinching during his morning routine. This concept is often mentioned, but I can say from experience there is no doubt it works wonders.
Obedience is something that comes naturally to a submissive, but often because our society overwhelmingly imposes an equality standard, us submissives need your help in having our obedience to you to be true. If you will enjoy training, we will enjoy being taught to tune into your wants and you will find your submissive husband quickly enjoying following your directions the way you like to see him.