Semicolon and Grammar

Hi there .. I am still learning English and my writing skills are very poor .. wanted a help in punctuating the below sentence :

I would like to welcome you to the new school year 2013 ( here ; to link or not ) wishing you and your family success and perosperity. Over the year, our school is working ( or was working? or has been working ? ) closely with parents to instil the value of culture in our children.

Appreciate your help and thanks in advance .
BB

 

Comma, not a semico;on, and has been working.

 

Do I have to put the comma ?

One more 2 questions :

1- After Finally what should I use ( , or ; ) like in :

Finally ( ? ) I would like to thank you for your usual cooperation .

2- We are looking forward to ( or we look forward to ) leading your children through a wonderful experience .

Thanks a lot

 

.
1. Comma

2. We look forward to is slightly crisper.