All documents listed above are easy to get and you should have already them available. What you can't do yourself is an invitation to Russia, which is issued according to the type of visa you will get.

Tourist invitations are issued either by a Russian travel agency properly registered with the Ministry of Foreign Affairs and possessing a valid "tour reference" number. They are normally issued for 30 days, but the Consulate of Russia may limit this period to 2 weeks. Usually fax copies of invitations are acceptable.
Business invitations are issued by the Ministry of Interior Affairs. These allow a longer stay - up to 12 months and can be either sent to you by fax or e-mail (if the consulate accepts copies) or posted (if the consulate requires originals). A business invitation can be sometimes sent in the form of a telex directly from the Ministry of Foreign Affairs to the consulate (the most convenient option for you, because you just need to bring your passport, photos, application form and a fee, but also slightly more expensive).
Private invitations are issued by the Ministry of Interior Affairs, usually 6-8 weeks are required for approval, and the Russian consulates accept only origins of them.