Any help or advise would be greatly appreciated

My laptop has fallen apart , so on Wednesday I am going shopping for a new one. I have 500 euro but am not really up on what is good or not.

Basically I am looking for a laptop that has 3gb, that the battery life is as long as possible and one that will enable me to watch tennis streams

Any recommendations or help would be great as I am getting a sore head from reading different spec's and not having a clue what it all means

Many Thanks