Everyone can post ANN and bounty threads. Just Newbies can't post images, unless they have Copper Membership. You need images in order to make eye-catching ANN. There are no certain requirements for these topics, it only shouldn't break any of forum rules. But if you want to make nice and professional ANN and you don't know how to do that, you can hire designer and he will create layout of your ANN post. Bounty threads aren't neccessary need to have images, you can write it in plain text. But it would be better to hire bounty manager who knows what and how exactly he needs to do.