It's on the lower end of things, but it should behave.
You can download a trial version and test it out for yourself. However, if you are expecting After Effects to behave like an editing application, you will be surprised. It isn't made for video editing. I highly recommend going through some basic training before diving into it yourself: Getting started with After Effects
what system hardware do you recommend ?
I have some experience with the program- mostly basic stuff
I am using also premiere and photoshop
For After Effects I recommend getting as high a clock speed on the processor as you can afford. In a future version, it's possible that AE will be able to use multiple cores well, but currently the core clock speed makes a bigger difference.
For After Effects I recommend getting 4 GB of RAM for every core of your processor.
For After Effects I recommend getting an SSD that you can use for AE's cache. If it's the same one running the OS and your programs, that's acceptable, but DON'T use it for anything else like your footage.
For After Effects you don't need to worry about your GPU very much. Unless you plan to use the obsolete ray-traced renderer (and I don't know of many folks that do), AE doesn't use the GPU for a whole lot. Now, some third-party plugins like Element do use the GPU and Premiere does too, but you'll need to check their requirements. Although, I've heard good things about the GTX 970 for both Element and Premiere.