i dont have a green house

You'll be ok on the windowledge, but I hope it's a warm one for chillis and aubs.
The seed pkts will tell you when to start them for the variety you have.....seed pkts are always a good place to look for information

I use my window sills for seeds (turning them regularly) and when the weather gets a bit warmer I move them in their trays outside to one of those shelf things with a clear plastic cover. You can remove the cover on sunny days to harden them off slowly then either put them in the ground/ transplant into 3" pots depending on type. I usually pot on tomatoes/beans/cougettes/peppers etc and plant out celeriac/leeks/cabbages/lettuce etc. 
 Many seeds should be sown in the ground when the time is right so seed boxes are unnecessary. Just read the blurb on the packet.

are my window sills just as goot for geting things started i want to grow some toms and courgettes chillis aubergines and courgettes and when should i start them off

As Mum and Vietta say, check the seed packets.  I don't have a greenhouse either, I usually start chillis in Feb (they like heat, use the airing cupboard if you have one, otherwise they take ages to germinate), toms in March and courgettes in April.  I don't grow aubs but prob April as well.  No point sowing them too soon before you can plant them out.

so if i glue foil to me nets lol they can just sit there lol

good for the plants but bit dark inside the room if you keep the blind down surely