Hey there...well i dont know about your area's normal fee's but i guess wherever you are in the states or anywhere else in the world for that matter! Charging a flat fee has nothing to do with how good you think your work is...

Its good enough for you to get jobs...that's all you need to know....as you get better the job offers get more....abundant let's say...

The price range I know from a couple of photographers I worked with (i was the client..well representing the client anyway) and they charged roughly..or on average $2000 per day of shooting..now according to what you would like to charge per hour, that would mean 40 hours.... now they are experienced photographers each with about 15-20 years of experience...i would say cutting it in half or more and including in that price all retouching...would be fair...so flat $500/day including retouching of specific photos...

Sounds fair start for me...you definitely don't want to go too cheap at first....it might get clients used to your lower wages.....

That is my own little humble opinion