MR Ussary Rocks!
The number of stars (or the level of a monster) can range from one star to twelve stars.
yes you can
you have to have a tuner monster on the field or the tuner monster it says you need on the synchro monster card and another monster (not a tuner) that when you add the stars from the tuner and non-tuner add up and equal the same number of stars on the synchro monster. Then you send those cards to the graveyard and special summon the synchro monster from where you fusion monsters should be
Jurassic attack
it is rated five stars
3 stars
Bowser
No. You tribute one monster of any level to summon a lv 5 or 6 monster, and two monsters of any level to summon a lv7+ monster. Some monsters have additional requirements, three tributes for example. But the level of the tributed monster is rarely relevant.
A blob-like alien monster in the ZBS radio serial, Stars & Stuff.
If you're only using sugar to make sugar stars, the easiest way is to melt the sugar into caramel, pour it onto a tray, leave it until it's just warm, then use a star shaped cookie cutter to cut stars. (If it cools too much, aim a hot hairdryer at it). If you want to use other ingredients, the easiest way to make stars is to make a cookie dough, bake in a sheet for 3/4 of the recommended time, then cut stars from it, then finish baking. (Cutting after some baking because cookie doughs spread a great deal during baking. Cookie dough cut into stars before being baked would spread and lose their star shape.) I can't think of a way that you can make stars just out of sugar (without having to melt the sugar) - sugar is not very malleable, and does not stick to itself easily. You could use a cake decorating fondant, or gum paste and just cut stars from that. Both are practically just sugar.
Gypceros or mining on quests 4 stars or higher
It depends on the level. If it is 4 stars or under, then no. If it is 5-6 stars, then you need to tribute 1 monster. If it is 7-12 stars, you need to tribute 2 monsters. Many high level monsters cannot be tribute summoned though and will have their own summoning text.