@classical_hero
Fred first?
Short answer: it won't work.
Long answer:
Which city would you attack first?
a) Hamburg
Our soldiers are near Hamburg, we could move them to India now and attack on the next turn. We could bust the city but we would lose our entire stack and JC doesn't have access to Hamburg, from where would he arrive? Even if we get Hamburg somehow, German culture from Berlin would kill it off. Culture from Capac, Izzy and Asoka wouldn't help either. JC would also have lot's of trouble from Berlin. He would lose a lot of units on that front. We have to attack Germany in a blitz attack.
b) Berlin
We have to move our soldiers there first. With JC's help and lot's of casualties, we would take Berlin eventually. We would also have some problems back home from Hamburg's rifles. Results would be bad, culture from Hamburg would kill Berlin off. Look at Washington or NY for illustration. Culture is power!

Again, Alex' and Capac's culture wouldn't help us.
To summarize, culture is very important in our war plans. Regarding the infantry, I don't expect Fred to have it so soon. For example, JC would need 13 turns to research fascism on its own. Fascism would cost us 4554

. Assembly line had cost us 9487

. Fred is a bit faster than JC, but I don't expect him to have Assembly line in the next 20 turns. Besides, he could be reseraching sth else first, Scientific Method maybe.
Like I said, we have to take Fred with a quick attack with enough soldiers.
Attacking
Alex so soon is not so useful. Culture problems again! However, if/when Liz attacks Alex we have to re-evaluate things.
Izzy we can take now!
- Turn 0: war declaration, troop movement
- Turn 1: bombardment
- Turn 2: city loses every defender but one (turn off stack attack please)
Hopefully JC moves in on turn 2 and takes the city. Watch his movements, it is important that he doesn't move in too fast. You can't stop him, but you can time the request for attack on Madrid.
Promotions
I think you should promote two soldiers immediately like kcd_swede suggested. One infantry soldier should get combat + medic, other just combat I. The second soldier should get his combat II promotion after collateral damage from Izzy to improve healing. Look at the experience, we have 2 soldiers that can only get one promotion. Cannons should get CR promotions. That was better than barrage in my testings, CR will reduce casualties. Soldiers should have combat I and II for LB's.
City production
Put more infantry in the queue to make sure Kremlin doesn't get any hammers. That's in the queue to prevent JC from building it. We should build only infantry atm. If we unlock HE, we should built it immediately of course.
Cash
Take the 27 gpt from JC, we need it. We have cash problems, taking Madrid should bring a lot of money, take that from JC too. However, if we don't get much, we have to consider building economic buildings for the upgrades.
Home defense and reinforcements
I think 2 infantry soldiers at least should stay back home. Warrior should go to England now. We have enough to take Izzy and probably Toku without reinforcements, but we should send more soldiers to the front.
Great people
I think we should bulb at this point to hurry things up. Scientist can give

for Electricity, engineer for Combustion or Industrialism, artist for Railroad. However, if we do get a GE, we should consider keeping him for UN or Space Elevator. Remember, we can built the UN with a GE in
any city in the world that is building it. Space Elevator could be a waste, we should evaluate that.
Research
Regarding research, we do need tanks. However, that means Railroad, Combustion, Electricity and Industrialism. We need ~30 turns of combined research for that, we are teching to slow! More good land ASAP! We are dreaming of world domination, but let's be realistic. Let's take some lands first to improve research first. If we lose our stack in the war with Fred and get culture problems, we'll be in a tough position.
Physics in 1 turn and then we can get artillery in ~8 turns. I recommend:
Physics - Artillery - Electricity - Industrialism (Marines!) - Railroad - Combustion (Tanks!)
Railroad - Combustion first doesn't look like a good option.
Btw, more elaborate planning from an active player would be greatly appreciated!