Hi Acer. One of the first things you can do is join an Astronomy club. Most clubs have an instrument making section, specially in the US. You can also join this group
http://www.atmsite.org/contrib/Pouls.../atmsect1.html theyare very helpful. Also try this link they are full of information.
http://www.stellafane.com/misc/links.html#Figuring . I would also seriously consider buying
How to make a telescope by Jean Texereau and
A manual for amateur telescope makers by Karine and Jean- Mark Lecleire. both these books are available here
http://www.willbell.com/tm/index.htm .
Regards Cristian