You might try McCall's pattern 4323 or 2933, either which could be adapted with pockets on the outside of the flaps using the existing pocket patterns.
for a photo
According to the pattern, one needs 1 3/8 yard for purse and 5/8 yard for lining and 1 1/4 yard interfacing....
I generally try a pattern once, just to get the hang of things- like linings etc and then think of embellishments etc
Hope that helps