No, but inmates can get their pictures taken inside and mail it to you

only the price of a stamp... (even inmates with no money on their books can get stamps from the institution as they offer for indigent inmates.)

In federal and state there are no limits, but county jails sometimes have limits of 10 or so as the inmate storage space is limited

you should call the jail first before trying to send anything inside 

The tablets cost about $140, in some places (NY State) the tablets are actually free to use. Where they get you is there is a steep cost to access the content. Emails are $0.30 - $0.50 each, a simple game like solitaire (free on your phone) is $7.99, song downloads and movie rentals and purchases range from $2 to $25. These rates are at the cheaper end of the market. Just this summer, Florida inmates lost about $11.3 million in music

If you ask an inmate (as you are now), the more the merrier :)... but you as a person on the outside trying to take care of your own expenses you should budget what you can afford to send. If money is no object, you might consider $75/wk for commissary and phone. In the federal system, they can only spend $69/month on phone and $315 on commissary + whatever money the emails are. It can become quite expensive so be careful

An inmate's "business" while incarcerated is private and they are afforded the same protection anyone on the outside would. Therefore, that information is not available. If you "know" this random inmate's name you can certainly use the services of InmateAid to convey that in the form of photos, greeting cards, magazines, etc. 

No, you cannot send foodstuffs unless they have an arrangement with a commissary pack company. However, we do not see anything showing that they do. You can use Amazon to send them paperback books. Another option would be to put money on their books so that they can shop in the prison commissary which has plenty of options like chocolates, cookies and snacks.

Only a 55 cent stamp

Yes, usually there is a notary that comes to the facility once a month. The inmate must request their services in advance of them coming.