While Dexter is correct that "normally, the resonant head is thinner than the batter head (thus swapping heads woudl not work) this is not always the case.
Many low cost drums come with the same head on the top and bottom (except for the snare). So I suggest you look at your resonant heads to confirm if they are thinner.
Regarding what heads to use - it can depend on very many factors, not the least of would be style of music, recorded tone you are looking for etc.
However, Remo Pinstripe's or Evan's G2's are both good 2 ply heads which are durable and which provide
a controlled sound.
Many people prefer single ply heads for a more open tone, but you can rarely go wrong with
a Pinstripe or a G2.
For the snare, by far the most used head is a Remo Coated Ambasador - however I'm a big fan of the Evans "Dry Vent" heads.
A good rule of thumb to follow for tom heads is about $1 per inch - meaning a 12" head will cost about $12. Actually, you should be able find heads for less than that (say $11 instead of $12) - depending on your market.
By the way, there is an old saying " The only dumb question is that which is not asked" - meaning there is no such thing as a dumb question.