I installed Trick Flow intakes on my car awhile back ago and it is a fairly easy process, easier if the motor is out of the car. Most of the hardware and gaskets are available at your local parts stores, however I choose to order my parts from Summit just because it's simple to return things if something is damaged and such. I don't know what hardware you're missing or what all you need, so I'll post links to everything you'll need.
Intake bolts
ARP 154-2001 - ARP Chromemoly Intake Manifold Bolt Kits - summitracing.com
Water neck gasket
Fel-Pro 35067 - Fel-Pro Water Neck Gaskets - summitracing.com
EGR gasket (if you're even running EGR)
Ford Racing M-9464-A50 - Ford Racing EGR Gaskets - summitracing.com
Felpro intake gaskets
Fel-Pro Performance 1250 - Fel-Pro Performance Intake Manifold Gasket Sets - summitracing.com
As far as details or instructions on how to install the intakes, it's pretty self explanatory. Most of the gaskets come with instructions on how to install them, you may need a tube of black silicone or "gasket maker". I know on mine, I used a 1/4" bead of silicone "gasket maker" on the front and rear of my intakes where they meet the block instead of the actual gaskets. Some people have said running high rpms or excessive block pressure will blow out the gaskets so they've found the silicone holds up better. I've not had any problems either way. Hope this helps, good luck!