When you are planning a wedding one of the most important lists is your guest list. When you are thinking of all the people you want to invite there are many things to keep in mind.
I am going to be coming up with my guest list tonight. The first people on list will be all of my immediate family and all of my closest friends. While I am coming up with my list my fiance will be doing the same thing and writing down all of his immediate family and friends. My fiance and I have a lot of friends in common so that is always helpful. We have decided that we would like to invite around 120 people but once we write out our list we will see if it is possible to have that amount of people and not leave anyone out. You should have an idea of how many people you would like to invite so you can keep that in mind while thinking of people.
After you both write down all the close friends and family it is time to ask the family for help. I am lucky enough to have a sister who got married 3 years ago so I am having her send me her list to make sure I do not leave anyone important out. If you do not have that luxury then ask your mom, dad or anyone that knows a lot of the same people you know to help you come up with the people you might have forgot about.
After consulting others for help you should have a pretty good list of everyone you want to invite. If you look at that number and it is way to many people for the budget you are working with then you will have to either cross some people off your list or find a way to reduce your cost per person at the venue you chose.
Good luck I hope this helps you come up with a good list!