First things first, if you want to get to 10k followers, you must have an Instagram account. I recommend having a separate business accounts from your personal, so if you don’t already have one I’d make one. If you are just looking to grow your personal account, everything in this guide will also apply.
I also recommend opening up a separate email account for your business. Gmail is easiest. So if you don’t have a business email yet, I would just make a free one on google. If you want a professional email like firstname.lastname@example.org then I suggest getting it on gsuite. This is so you keep your business and personal accounts separate. It’s a great way to stay organized and makes things easy. Once you have a business email, use that to make your new instagram account.