I've frozen and reheated most foods with no complications at all, you just need to make sure they are heated up thoroughly.
After cooking the food, leave to cool for a bit before putting in the freezer. If you put warm food in your freezer it will heat up your freezer and maye defrost some things which wil then refreeze which isn't safe!
Put into ice cube trays or small pots for freezing, then once frozen you can pop them out and store in bags to allow yo extra room.
If yu haven't got a microwave yuo can defrost ver nigt in the fridge or on the counter during the day, if you do this, make sure you put it back in the fridge as soon as its defrosted so it doesn't warm up.
You could heat up the foodin a saucepan, pour it in, or fill a bowl with boiling water and ist it in there till its hot. Always better to make sure its hot and cool it down rather than just warm.
All of this is to kill the bugs, bacteria grows in warmth but can be killed by really heating it up hot so the key is to freeze quickly before anything can grow and then heat to make sure there is othing there before to give it to lo.
OMG that sound awful, enough to drive anyone to jars!! its really not that complicated and you just need to thing of basic food hygeine and common sense.
there's a good previous thread about chicken, check that outm it should answer your questions but do post back if it doesn't!
Happy cooking!
Kxx