Anything less than $100,000 is 990 EZ. Over $100,000 is 990 long form.
Make sure you keep acurate records, and that copies are passed down as officers change.
Our Little League got audited the year I was President, for a year I was not even on the board. It was a challenge to reconstruct documents. What got the IRS's interest was $30,000 we carried over from one year to the next. The local Park District had loaned up $200,000 to build our facilities on their land, and we did a special fundraising drive to pay off the balance, and our payment wasn't due until March, and all the fundraising was done the year before.