Now you have java,you need to go to www.minecraft.net.To make it easier for you,click the link below.If the link does not work,just search it up.

Now youre on www.minecraft.net,look to the right where it says buy game now.Do not click this unless you want to buy the ACTUAL game as this is just a beta.Anyway look down from buy now and it will say :

beta
in browser/download

click download.

Once you have clicked that follow the instructions onscreen.Download the one with the name of the program you run on e.g
Windows
Linux Etc.
It will take about five seconds to download.
When it has downloaded it will ask you for permission to run the program.
click "run" and the launcher will come up.
If you have made an account, log in on it or just play offine by clicking login.
if this does not work i do not know what to do,
as I just kept downloading it till it worked.

Thanks for reading and i hope it works :) jake