On question 2, you'll be sponsored skilled workers visa (tier 2). You can bring dependents with you, but they can only be spouse and children. Parent cannot be included. Even if you get ILR after 5 years, you can bring parent permanently, only if you can prove that the parent can't do daily activities by themselves and requires help.
comments
2 questions,
1. How much offer should i expect?
2. Can i take my single mother with me?
Currently working in Amazon India.
Yoe: 4 yr approx
Tc India: 48
https://www.gov.uk/uk-family-visa/adult-dependent-relative
Visit/tourist visa is the only option for your mother and at the moment, tourists from India are banned to enter the UK due to Indian Covid variant.