Total new to this, but trying to learn

Got an old RB 532, and winbox say 5.24, that I guess is the RB software version..
I am going to use this as a client, connecting to a AP and sharing the access via a local wireless router. (inside a waterproof box, first with an internal antenna, and if not, external like this
Do anyone got a quick guide for putting this up as a client? I think I got it all right with bridging all the devices and all other tips I found on this board.
I can search for wifi and connecting to my local wifi, providing the WPA password. But then it just say "Searching for network". Pushing the disconnect button, all wifi network around me lists up.
This turned out to be a bigger challenge than I can fix
