What are the important points to consider while ...

The best way is to look at the past records on how they’ve met deadlines, whether they provide training, quality of software product delivered and if needed, how fast they can deliver in case of urgent needs. www.gtssminds.com is one great IT outsourcing agency that specializes in bootstrapping and rescue process. 

Although the industry involved is not known, I will answer this question with a global answer.  I think the most important aspects to consider are cost containment techniques, level and manner of employee expertise (differentiating between theory and practical) and the financial solvency of the IT company chosen.

If further discussion is warranted, I would love to be involved.

One of the good ways to know how good an outsourcing IT firm is would be to look at their clients feedback of their services. You could clearly tell if the service is good if 99% of the feedback were good and only 1% says it isn't.