The mainspring should fit were you have a big round recess in the main plate.
The balance will fit where you have a bearing with an "endstone". Look from the front side and you will find one pivot hole with a small (0.5cm ?) cover plate. This will match with how the balance cock fits on one of the pilars on the opposite side.
Now try to check where the fourth wheel (which holds the seconds hand) fits. Look at the dial and where the seconds hand is to be located. Put the wheel in place.
Now take the escape wheel and mount so it interacts with the fourth wheel. There should only be one pivot hole to choose where the wheels interacts.
Between the escape wheel and balance should now be one hole where the pallet fork will fit.
The center wheel should interact with the mainspring barrel and, again, there should only be one pivot hole that allows this interaction.
The last wheel will be between the fourth wheel and the center wheel. You should only find one pivot hole which allows the third wheel to interac with both wheels on either side.
I have a hard time making out what is pivot holes and not in your picture but here is an ATTEMPT to guess where the wheels will go. (Don't get upset if I am wrong! I need to hold it in may hands to be sure!)
Which way to turn the wheels? Well Balance, pallet fork, fourth wheel (with second hand pivot) and mainspring should be self explanatory. The remaining whees will only fit one way to interact with the adjasent wheels.
Here is a picture that might come in handy:
Give it a try and see how it goes. Good luck!