Are there any more errors ?pls help!!!

G (grammar)    SP( spelling)  T (TENSES) P  (punctuation) PR( preposition)WO (word order) V ( vocabulary)

I  am  46  years old  and  married  for  twenty  years .We  have  got  three  children,one soon  and  two  daughters  .There  are

six, eight and eleven  years  old.I am an  electrical engineer and worked for a company who manufactured machines for procession

automatically.

At first, I am going to learn English in Great Britain.It's very important for my job.Then, I would like to have a little compagniy with

about ten coworker for myself.If it isn't possible,i'll manage a department who developed high technology machines.

I became the test sheets  for complete and return directly at you .You phoned at your agent about my course at your school in

Bristol.Very thanks for your trouble .I'm happy to come at your school and i'm sure to learn better English.I don't know my flight

numberon 5st March.I would let you as soon as possible.

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soon-son(sp),there-they(Sp).,electricalengineer(Electrical  Engineer) (P),worked-work(T),who-which(G),manufactured-manufactures (T),to have-to open (V) compagniy(SP),coworker-coworkers(G),who -which (G)developed- develops(T),very thanks-thank you very much (WO),come at -come to(P) 5st-5th(G) let you as soon-let you know as soon....

I have corrected what i know and i'm not sure how to correct the sentences -,I became the test sheets for complete and return directly at you.You phoned at your agent about my course at your school in Bristol.

Are my other corrections o.k. help please!!!!!

Paco,
You certainly are more than a beginner, and you have a command of grammatical understanding that it's too late in life for me to acquire.

But I will offer a couple of changes to your excellent revision, based on my simple credentials as a native speaker:

I am 46 years old and have been married for twenty years. We have three children: one son and two daughters. They are, respectively, six, eight and eleven years old.. I have been working as an electrical engineer for a company that manufactures machines for process automation. I intend to learn English in Great Britain because I think the language is very important for my job. After learning English, I would like to run my own company, though it might be a little one with ten employees or so. If that isn't possible, maybe I will manage a department within some company that produces high technology machines. I have completed the test sheets and have sent them back directly to you. Thank you for having your agent give me the information about my course in Bristol. I very much appreciate your taking the trouble. I'm looking forward to studying at your school, and I am sure I can polish my English there. I still don't know the number of the flight I will be taking on 5th March. I will let you know it as soon as I know it.

Hey Paco, just wait until somebody corrects mine. 

Try reading some of my Japanese some day..  (All I learned was from reading Shogun 25 years ago, and watching Kurosawa and Ozu films.)