I just put in my order for a Rancilio Silvia machine and a Rocky grinder but because this is all new to me, I am at a loss to what else I need to purchase? I know I will need to get a better tamper and a frothing pitcher. Will I need to know what size tamper and what size of a pitcher should I get? See, I am a novice when it comes to all of this but I intend on learning because I love coffee!
Thank you,
Susan

From the FAQ, see What are "must have" accessories for new espresso machine (excerpted below) and Start up accessories help.

HB wrote:A few comments:

• A twelve-ounce pitcher is fine for Silvia, though you will need to take care to avoid splashing milk.
• One container of Cafiza / JoeGlo will last many years. It serves to clean the grouphead and exit pathway through the solenoid (CleanCaf is primarily for descaling the boiler). See Randy's How To instructions on backflushing.
• Instead of CleanCaf, you can save by using citric acid, available at your local brewer supply store (1.5 to 2 tablespoons per liter/quart of water). One pound will last a lifetime. Unless your water is very hard, you can skip the water softener and simply descale monthly.
• The Coffee Tool by Pallo is a great group brush.
• I marked a demitasse instead of buying shotglasses.
• A thermometer with clip for frothing is nice to have.

With that, your essentials list looks complete.