I've never been camping other than to music festivals where the tent was the cheapest 2 man one available and most of the time is spent outside drinking cider 
I now have a 10 month old, a 5 year old and DH and am wanting to give it a go. We have £200ish to spend on a tent/carpet/etc. What should I be looking for to make sure its really waterproof?! I have awful memories of not being able to touch the inner layer of the tent as it was all damp and all our dry clothes got wet.
I'm assuming baby will just be alright in a travel cot but a bit worried about him getting cold. Any tips/experiences/camping essentials with babies and young children?
Thank you!