Are these sentences correct?

I graduated from Cairo University in 2005, since this  from then year till October 2010 I have worked as an assistant accountant. In 2010 I became a chartered accountant, and now I have my own office which recently opened at 2013.
I have an experience more than 8 years experience in my field, during this period I have learned a lot about budgets and financial accounts.
In addition, I have very good communication and computer skills. I am very good at using Microsoft Word and Excel as well as typing. skills and good at using I am familiar with Accounting software and I'm also good at speaking English. 
I will would be honored to be able to train with you  if i trained with yours as it will afford me gains me a high excellent experience in my field and create many more allows a lot of job opportunities for me.

Are these sentences correct?

I graduated from Cairo University in 2005, from this time/since then this year untill October 2010 I have worked as an assistant accountant. In 2010 i I became a charted accountant. Now I have my own office which opened recently at in 2013.
I have an more than 8 years experience in my field, during this period, i I have learned a lot about budgets and financial accounts.
In addition, I have the following skillls; very good communication and computer skills, I am very good highly competant at using Microsoft Word and Excel, I have excellent as well as typing skills and good I am well versed in at using Accounting software. In terms of my language skills, also good at I am proficient at in speaking English
I will be honored if i I can trained with yours as it I will gains me a high valuable experience in my field, and allows a lot of which will enhance my future job prospects opportunities.

I put in some different words other than good, to be more interesting. All the best Gillian :)

Are these sentences correct?

I graduated from Cairo University in 2005; since this year from then till October 2010 I have worked as an assistant accountant. In 2010 I became a chartered accountant. Now I have my own office which recently opened at in 2013.
I have an more than 8 years' experience more than 8 years in my field; during this period I have learned a lot about budgets and financial accounts.
In addition, I have very good communication and computer skills; I am very good at using Microsoft Word and Excel as well as typing skills and good at using Accounting software. I am also also good at typing and speaking English
I would be honored if I could trained with you as it will gains afford me a high valuable experience in my field and allows a lot of create many job opportunities for me.

You separate a lot of independent clauses with commas which really need to either be separate sentences or need semicolons. Take a look at this page for examples: https://owl.english.purdue.edu/engagement/2/1/34/