How do I evaluate a regression model in terms of its validity and usefulness? Please explain using the attached model outputs

• Manufacturing, Finance and Health-dummy categorical variables indicating
• sector. The reference category is Government
• Profitability- an index of profitability on a scale of 1-10
• Tenure- an index of how long the respondent firm has been a client
• Size- relative index of respondent firm size size in terms of turnover attributed to it
• Complexity- relative index of number and difficulty of projects on a scale of 1-10
• Satisfaction- internal measure from consultants performing post project analysis
• Upsell- internal measure of potential future business on a scale from 1-10