You can't upload a picture directly from your phone or computer. It needs to be hosted on an image hosting site. Many providers use imagecoast but there are others. You open a free account on the site, upload your pics there, then when you post your ad, you copy the url from the pic at the hosting site, and paste it in the box at the bottom of the post that says "picture url." You have to delete the http: and the slashes that are already in the box or they will double up, and the photo won't post. Since you already posted the ad, you can post a reply to the ad and post the photo in the reply. You can only post one ad per 7 days, but you can post as many replies to your own ad as you want. Many providers will do that to add several photos or to add more info.
As to links, you can't post links to any site that is a competitor to TER (i.e. Any sites that have reviews.) You can post links to your ad on Eros, slixa, cityguide, citysource, myproviderguide, p411, date-check, and many more. You can also post a link to your personal website if you have one, but in order to do that, your site also must have a link back to TER?
The best way to get known and get reviews is to post your ad every 7 days, on your ad board, introduce yourself on your regional discussion board and join in conversations there, and answer ISOs. Don't make your introduction sound like an ad, and don't post a link or picture in it, or it will get deleted. Ads only go on ad boards. You can however post your link in any reply to a thread (just not a thread starter) and I believe you are required to post a link if you answer an ISO.
You can also post photos on the photo only board.
Since most new providers come on here asking how to post an ad and you actually already posted your ad, you have a headstart and must have already done some digging around and reading. Good for you! If you haven't already, do check out the top thread on this page, the "TER Instruction Manual" and read down this newbie board and back a few pages. That should give you a lot of info on navigating TER. Then come back here to the newbie board and ask any specific questions you might have. There are a lot of helpful people here (and a couple not so helpful but reading down this page and back a few should give you a pretty good idea of who is who

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Good luck and have fun!
-- Modified on 11/30/2016 9:55:02 PM