Moving on new server

Hello,

Soon I want to change my webhosting. Domain is same, so I only need to change dns server and upload wp.
I have few question before start migration.

I need to backup all data (files, images, folders) of current wp on HDD.
1. Backup database (should I check in phpmyAdmin “drop if table exists” when I do backup???)

2. Now, should I install wordpress on new webhosting and upload backup, or just upload all data without install???
3. After uploading, I need to update database (with backup), right?

I have already read manual about moving wp, but still I am not sure what to do.
Thanks in advance.