I wouldn't invest in Adobe products unless you know for sure what you want to do, and for sure that you want to do it

I speak as a person who is a long-time Adobe products user and personally I think they are *wonderful* - but also expensive for someone who is just learning either graphic design or photo editing etc. I also am not a fan of the move to the "cloud" pricing scheme - I do like that it means you get all the latest updates as they come out, but I'd also been very happy updating every other release or so as longcut mentioned. I took a quick look at the deal linked above, and it's a good deal for what you get (if you're actually going to use it) - otoh, it's only good for one year and then the price per month goes up. It is great software though

FWIW I run on a Mac and, as longcut mentioned, the products consume RAM like crazy. Intermediary files can be quite large too.
I can't point you to any specific inexpensive products but fwiw, my kids seem to find them all over the place and they have used different products at school - in this case, unless your ds is begging to start up now before school starts, I'd probably wait and see what software they use in the class. You can most likely find something else that's a better starter program in terms of price.
polarbear