Upvote:6
Yes, you will need to go through Immigration, pick up your bags and go through Customs before you can connect to your domestic flight. I can't give you exact advice since the shiny new International terminal just opened last week as I type this, and the LAX website is stunningly useless, but there should be an AA service counter after Customs that can advise you on where you can check in and drop ("re-deposit") your bags. Qantas has a vague diagram of what to expect.
And as for what you can do to make your connection smooth... well, connect somewhere outside the US and fly direct to DFW next time. International-to-domestic transfers anywhere in the US are terrible and LAX is particularly bad.