As soon as the meal has cooked, put it into freezer-appropriate dishes. These can be tupperware/plastic, or those foil dishes that take-away places use.
I would put it straight into the freezer then. If you have made a lot, it might be a good idea to let them cool down a little bit because you don't want hot stuff to affect stuff that's already in your freezer.
I don't think it will do you any harm to put frozen stuff straight into the oven, but you will have to allow longer time for it to cook through - and to cook without burning, so would probably suggest that you take it out in the morning and leave it to defrost during the day.
If it's defrosted, you can probably cook it through properly in 20-30 mins, but always make sure that it's piping hot in the middle before you serve it.