6.To find dungeons and lava and stuff like diamonds,gold,iron etc. use the xray texture pack.the link for it is right below this text!

7.How to get a texturepack.
when you click the download button to the texturepack you hve to wait about 5 seconds.When the download is complete you have to right-click the the bottom left of the screen where it says the name of your texturepack and it will say:show in folder,click that and and where it says the name of the texturepack right click and and press copy.then open minecraft up and go in mods and texturepacks in the menu, click open texture pack file and paste in the big box.Then close the box that comes up and your new texture pack will appear,then click on it.Then go on singleplayer and your texturepack will be on!