Generally, Synchro Summoning sends cards from the field to the Graveyard. There are some cards that allow you to use monsters in your hand as Synchro Material Monsters instead, such as Eccentric Boy.
Eccentric Boy
Attribute: WIND
Type: Spellcaster/Tuner/Effect
Level: 3
ATK: 800
DEF: 200
When using this card as a Synchro Material Monster, the other Synchro Material Monsters is 1 monster in your hand. The Synchro Monster that used this card as a Synchro Material Monster cannot activate its effect, its effect(s) is negated, and is removed from play when removed from the field.
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No, a Synchro Summon is a kind of Special Summon.
Yes, you can, as a Synchro Summon is a special summon, you can perform a Normal Summon on the same turn as one or more Synchro Summons.
No, you do not 'tribute' the Synchro Material for a Synchro Summon. They are sent to the graveyard, not tributed. You can tribute an opponents synchro monster for "Assault Mode Activate!" to summon the assault mode monster from your deck.
Yes, Tokens have a level and can be used in a Synchro Summon.
No, Synchro material must be face-up.