padawanlost:

• How many
  clones there were?

People are
still debating over how many clones were create during the clones. We have
conflicting sources and the numbers can be anywhere between 200.000 and one
billion. The guides says initially 3 millions clones were created but that is a
controversial number.

• And how many clones a single Jedi General could
  have?

Depends on
the Jedi and their units.

• Squad (9 troopers): The
  smallest unit in the Grand Army is the squad, led by a clone sergeant.
• Platoon (36 troopers):
  A platoon consists of four squads, led by a clone lieutenant.
• Company (144 troopers plus
  support personnel): A comany consists of four platoons, led by a
  clone captain.
• Battalion (576 troopers
  plus support personnel): A battalion consists of four companies, led
  by a clone battalion commander.
• Regiment (2,304 troopers
  plus support personnel): A regiment consists of four battalions, led
  by a clone regimental commander and a Jedi commander, often a Padawan serving a
  Jedi general.
• Brigade (9,216 troopers
  plus support personnel): A brigade consists of four regiments, led
  by a clone senior commander and a Jedi general. Some brigades were called
  “legions.”
• Corps (36,864 troopers
  plus support personnel): A corps consists of four brigades, led by a
  clone marshal commander and a Jedi general.
• Sector Army (147,456
  troopers plus support personnel): A Sector Army consists of four
  corps, commanded by a highly experienced Jedi general.
• Systems Army (294,912
  troopers plus support personnel): A Systems Army consists of two
  Sector Armies, commanded by a Jedi general, a role filled at this level by
  members of the Jedi High Council.
• Grand Army (3,000,000+ troopers plus
  support personnel): The Grand Army as originally constituted
  consisted of all ten Systems Armies, led by Supreme Chancellor Palpatine as
  Commander in Chief. [The Essential Guide to Warfare: Star Wars by Jason Fry]

•  Were there
  enough Jedi to command the whole clone army or were there clones that didn’t
  had a Jedi as a general?

No, the GAR
didn’t have the resources to protect the entire galaxy and the Jeid didn’t have
the manpower to overseer everything so some non-Jedi were eventually given military
positions (including general).