Advice to a really dumb question.

Tomorrow me and my husband are going to do DIY maternity pictures (my husband and MIL) are going to do pictures and then I’m going to edit them. My question is does anyone have any ideas on what to wear, how to take pictures? The pictures will be taken at a local park. There’s a pond with a fountain in the middle, benches, trees, shelters. I’m just beyond clueless on how to do stuff.