First property tenant in place? questions

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Ok so I am closing on my first property by next week and have alot of questions regarding the tenant who is living upstairs. They have been there for 7 years and pay 625 (rent is 725 but does "maintence" on the property so he saves 100) a month which I believe is under the market by $50. They are on a month to month lease so I can write my own lease now once I close.

First the seller is going to give me his security deposit? Is that something that is allowed or should I allow him to return it to the tenant and then he can give me the deposit himself and start over?

How should I go about getting the rent higher to market value or should i?

Also what exactly is this maintenance that he does? would it involve he is responsible for mowing the lawn, shoveling etc. ? Is this something you typically have one of your tenants do in your multi'families or not?

He also has some of his kids shoes, toys in the attic. To my understanding I should tell him that needs to be clear or charge him a storage space a month?

Also the same is with the garage he has tools etc. in there but I can either make that another charge or if not rent it to someone who wants to store their car?

Still nervous about actually being a landlord but also excited that I am taking on a new experience. I have done a bunch of research but still is a little intimating when you have an existing tenant instead of new ones thanks in advance!