Hello IAm. Your experience on the committee will show you have some idea of how a pre-school is run. You have two children so you do have experience. Show willing, be keen and friendly. Say you are willing to train and go on any courses that will help you do your job well.
Child protection is a hot topic always so make sure you are aware of the procedures as they will probably ask you scenario questions at interview. Being creative is a really good skill as this is something you would use daily both on an arts and crafts level and also thinking on your feet eg - what can we use to make a spaceship? How can we turn this corner in to a pirate ship etc.. I started off working in a pre-school with minimal experience 5 1/2 years ago and I am now qualified and deputy supervisor there so it is possible. Good luck.
Hey dont worry too much, if the pre school is like the one I work for they will be willing to give u a chance, as said above u have children so lots of experience and being on the committee is good also. The pre school I work for let me volunteer, then put me thru courses I have been there 5 yrs now and am a level 3 and supervisor there now. So u can do it, be honest about how much u would like this. Goodluck.