As long as the card that summoned the token does not mention any restrictions, then yes, token monsters may freely be tributed for a summon.
Some do have restrictions set on them, for example, Sheep Tokens from Scapegoat cannot be tributed for a tribute summon, but could be tributed as the cost for a Special Summon.
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not all tokens can be sacrificed. If it is indicated that a summoned token cannot be used as a tribute then it is not.
If the token is considered destroyed by battle, then it will leave the field and cease to exist, like any regular token monster.
You can tribute a special summoned monster, yes.
A level 7 monster needs two tributes; you can tribute a level 5 monster but must also tribute a second monster.
A level 8 monster needs two tributes, so you can tribute a level 6 monster but must also tribute a second monster.