The Frontiersmen Strategy forum on www.naturalselection.com is quite useful... has a compiled list of guides, many for comming - even on specific maps.
At first, it may help to play with Marines whom you know - that way, it may be a bit easier skill-wise, and also you probably won't feel as bad after losing :)
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Oh really!? Who made such a stupendous and wonderful index of said guides and facts?!?!
*blinks innocently*
*casts the fishing for compliments reel*
Some newbie comm tips. Watch competent comms who win often. See what works for them. Focus on one map to learn, since strategies to depend on the map.
Get a1 first. Try and start upgrading the armory early (early hmgs are much better fade killers than a smattering of sgs, esp with the new drop off damage).
Focus your marines on whre the alien RTs are. Really rein them in on those. There will always be the random rine who goes caps rts for you, worry more on taking theirs down. Constantly.
Get PGs early, get a forward pg deep into territory ASAP.
Be ready to take down the 2nd hive (building, hopefully) at around 3 ish minutes, Fades around that time too.
Keep focusing you marines on what to do. If youdon't they'll just rambo. This is triply important when the first fade shows it's face.