Welcome Jeane.
All of us once had only been working with InfoPath for one week, oh how time flies.
You should be able to highlight or select the area at the bottom of your form, or the whole form if it is all centered and then use the center justification button in the toolbar. It should be pretty straight forward but sometimes one little area can get you or it could be in a section or something. You could also cut it out (ctrl+x), delete the area, and then paste it back (ctrl+v). Sometimes that can clear things up too.
The zoom feature I just had another questions about today. In Word and other office Apps they have built in the zoom feature but in InfoPath they have not, at least not yet. It is probably because as a form design you make the document and its components whatever size you want.
If you want a form that interacts with a database then you have to start it as a database form from the get go. Create new form and then select database as the type and follow the prompts.
My advice, if I was in your shoes, and looking back at what i could tell myself now...
I would download the free Database Accelerator Web Services Suite. It is more for advanced forms but in my experience once you show your boss or your coworkers what InfoPath and electronic forms can do they will pretty quickly want you to create a whole ERP system built on InfoPath. In that case you will want the tools in place to create enterprise solutions. DBXL includes all the features and tools you will need to deliver these solutions. There are lots of tutorials included and many on this site to get you started. You can use SQL Express, which is free, and IIS to get your development environment setup. This can save you lots of heartache from trying to use Access with a multi-user form.
Just my two cents worth...
Qdabra Database Accelerator Suite Version 2.0 - Developer