If you have a bucket, manually dig around underground until you find lava, then get reasonably close with your bucket and right click. Your bucket will fill with lava. Move back to your place, then rightclick on a block to place that lava.
Be careful, as the lava you place will being flowing down.
Also, lava burns close-by wooden things.
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look it up on minecraft wiki, it really depends of what light, whether it is fire, glowstone or lava.
You can find lava underground.
Diamonds are located near a natural lava source. Making your own lava source does not magically make diamonds appear.
Yes, bedrock will block lava.
no