Girls help me out plz?

allrite i hang out with this gutrl aalot and i make her laff all the time and we love to be with each other. im taking her on a furst "date" soon and i want to know how long should i wait to tell her i love her. like the 5th date or the 2nd or the date after we kiss or whenever i should do it so as not to seem needy. also do i need to ask b4 calling her my girlfrend or is it somthing that u just start doing. and nicknames. when should those be started and what should they be. and if u have any ideas on sometihng romantic to do that would be great. oh yeah last question. how romantic should i try to be on the 1st date. i want to let her know i am different then the other guys she has dated but i dont wanna seem desperate or creepy or needy. thnx alot ladies. pttx.