I'm sorry to tell you that you cannot post graphics and banners if you are a newbie,you can hire some one to post in your behalf but you can not edit it yourself,you could end paying the guy for every change you'll going to do,much better to increase your level to member rank so you can post graphics and banners to your announcement.
Is it possible to post images as a jr. member? also will i be able to style text and links?
Yes, as a junior member you will be able to post images, links, images with embed links, a lot of features will be activated but it takes more then 2 weeks to be Jr, as you can only have 14 activity/2Weeks. Keep posting or connecting.