Have a youth weekend, charge the youths who want to come, do some sports, socializing and music it will not cost you very much and will give youths a good day or weekout out also you will make money for the church.
You could also have a church fete to make some money with stalls and animals to pet etc.
hope these ideas help
You could also do small things such as bake sales or get a school to sponsor you and help you to raise money.