It’s usually best to remove the personal transactions if they’re not related to the business to avoid confusion, however, it’s often down to personal preference on how you actually handle this.
A big positive is that you have a separate business and personal bank account - that will certainly help with a clear trail for HMRC.
Personal transactions should be added to the “Proprietor Drawings Account”, which acts as your personal account. This bank account would have been created for you when you opened your QuickFile account.
The suspense account is just a holding account for anything that the system doesn’t know what to do with - including untagged entries. This will show on your balance sheet, so it’s good idea to ensure the balance is 0 at year end.
I hope this helps.