Congratulations!
Here is what I would advise from my experience
Firstly, your wedding = your decision - this is easier of you pay for everything yourselves
Find good suppliers then let them to their job
Keep it simple, don't sweat the small stuff, don't faff around with themes, dress codes, favours, cars, bridesmaids. Your guests couldn't care less about all that.
Invite people to everything - reduce your list down to people you would gladly spend fifty quid on for a restaurant meal
Make sure people have an idea of timings - particularly the elderly, those with health problems or those who need to make childcare arrangements
Don't make people hang around with nothing to do for ages. Make sure they get food, drink and somewhere to sit.
Keep formal photos to a minimum, then give your guests a drink and get the photographer to take loads of informal shots. Those are our favourites
Have a wonderful day!