The Dark Charizard is worth about £70 in good condition however yours looks a little creased from the picture, so you may not get that for it. Possibly £50 at a rough guess, maybe less. The mew, in good condition about £150. The other Charizard, in good condition about £400. These are just rough estimates based on previously sold cards on ebay, UK. So could be totally off, if your from the US they may be worth more as US has a larger audience than UK.
I would also recommend sending these off to either PSA, CGC or BGS. These companies have the most experience from what i know off, so there graded cards tend to sell for more. Especially PSA cards as they are the oldest/most well know company for card authentication and grading.