Putting together first grow. Any knowledge or tips would be greatly appreciated!

Hi Everyone!

As you can tell by the title I am putting together my first grow! I have been doing alot of research and reading the post's which you all have posted and they have been very helpful. However saying that I could still use any assistance which could be given!

First off, I am planning on ordering Afghan Kush X White Widow from the tude. I selected this strain because of its short grow time and its high resistance to disease and mold. Because of that I figured it would be a good strain to start with! (Plus it sounds dank as hell :D)

Now I will tell you about the items that I plan to put in my grow tent. Once again I am new so if you have any improvements I would greatly appreciate it!
1. 48X24X60 grow tent (reflective mylar inside)
2. Light- Sun System 2-400 Watt which I will use an MH bulb for veg and HPS for flowering
3. ventilation- I am working on a budget so this is one area I could definatly use some help on. I found a 4 inch fan from sears (GRO1 4 inch High-Output In-Line Duct Fan) for 70 bucks and a carbon scrubber filter (GRO1 Hydronponics Carbon Scrubber Filter-4in x 10in) for 50 bucks. Would this be a decent set-up? and would I also need some sort of exhaust system?

Any suggestions or improvements on seed strain, seed bank, light, ventilation, or anything that could improve my overall growing would be greatly appreciated!

Thanks for taking the time to read my post and take it easy :rastasmoke: