Since you don't have a compression tester yet. Try this.
Have a friend help you. Take the spark plug out and hold your thumb over the spark plug hole. Have your friend kick start the bike. If the compression is strong enough, it should push your thumb off the hole fairly easily. If it does, you should have enough compression to start the bike.
To test for spark - take the spark plug out of the cylinder, keep it in the boot, hold the plug tip against the cylinder head, turn the key on, and work the kick start lever. Turn out the light or dim the lights and watch the spark at the tip. It should be consistent (keep sparking throughout the time that the engine turns) and blue. It's often easier to do this with the help of a friend as well.