Fix Some Bugs on Wordpress Theme, Copy some Code to Backend

Fix Some Bugs on Wordpress Theme 1) Make a specific field "check boxes," or another filed mandatory when creating a listing depending on the users selection. 2) Fix, Add Multiple Images Issue. On the create listing page there is a gallery. You can only add one image to the gallery, when you try to upload another image the first image is replaced. I need this fixed so I can add multiple images. 3) When user is editing a listing, make sure the location field previously set is pulled and populated in the location fields. 4) need to be able to un-check the purchasable extras box 5) Copy the "select date of availbility code" and copy "purchasable extras code" to back end admin panel for editing and creating listings