Honestly it might happen straight away, it might take months. There’s no way of predicting it, but generally most healthy couples will have conceived within about 6 months - a year. TBH most people I know it happened in under 3 months, and others it took much much longer.
Start taking folic acid, and get into shape, because the first trimester you probably won’t want to exercise, so having good fitness now will make a huge difference.
other than that, do everything you want! Go to the cinema, go for fancy meals, go and stay in an adults only hotel with a hot tub and have leisurely breakfast in bed. Read all the books you’ve been putting off.
Drink the wine, eat the food and have fun.
Check your works maternity / paternity policy and make sure you’ve worked out how that will apply, think about what you’d like post baby work to look like and agree it with your partner.
Do any jobs around the house you’ve been putting off!