New to freelancing, need advice quick.

[Anonymous]

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hows it going everybody, im new to the form so be easy on me.

I am a student at millersville University. i am a robotic engineer major, with a minor in CADD.   i have been doing 3d Cadd work for years now, i am doing an intership right now, i am a designer for a start up comapny that is having me do Drafiting, designing, and engineering work for new deisgns. i currently designed 3 products that are being taken to market in the next few weeks.  i was given the Okay to start freelancing using my company computer and softwear for the next few months while we have some down time.  

another company contacted me to do some work for them. They need me to build them a masive computer tower for the market. they have a tower that they want me to base my design off of.

i am new to the freelaning feild and i was wondering if anyone could help me figure out what to charge this company, they are a small start up company that has more work for me in the future.

my next question is, how many hours would you think a desgin of this size would take  from start to finish,but to be honest i have never tracked my hours. i just work when i can and fisnish the project befor the dead line.

thanks for the help everyone!