Advice on Using Purchased Gmail Accounts

Hi- I purchased 50 aged gmail accounts. I was emailed the login/pw/recovery email. The email had bullet items I should observe to not get dinged. This is for my business and Im new to this so I was hoping some of you would give me pointers so I dont mess this up. My questions are:

1. The email says 1 ip and 1 browser for each gmail- So I need 50 ips? Any recommendations where to get those?
2. Use private proxies.I found a site that offers dedicated ips and proxy on a subscription basis- Is that the best route?
3. Do I need to do anything to the cpu I will be using between logins like restore to factory default? I plan to post a review and upload some photos to my Google Place.
Sorry for the rookie questions but I figured if anyone could help it would be the ppl here. Thank you for any replies/advice.

You can get proxies from BHW sellers use the search button

1st and last advice is this. Change the password and recovery email/phone number. Save the new recovery email and passwords.

The most important part to keep your accounts safe is to link a proxy to each account. I know its a tough job if you do it manually but account safety is your no1 priority so take care of that.

Use proxy to keep your each accounts in safe

Ask the gmail seller who created gmail in which country and use a private proxy in that country

Don't overuse the accounts either. If you receive verification e-mails from certain (sketchy) websites at start - Google can be triggered easily.

You really need to make sure that the IP you use for 1 will be dedicated to an account alone. Having more will put your accounts at risk.