Hi guys, I need some help writing a list from what I have, for Rebels & Empire, not tournament good but competitive.
I have:

Empire:
3 TIE Fighters (all pilots)
1 TIE Phantom

1 TIE Advanced

Rebels:

2 X-Wings (all pilots)

1 A-Wing (rebel ace's pilots only)

1 B-Wing (rebel ace's pilots only)

I've had some previous success as empire with the core set only, but I'm not sure how best to play with my current collection.

Cheers in advance for any help

Try this:

http://x-wing.fabpsb.net/gindex.php?lng=en

It allows you to select which sets you have, and will build you something with them.

For instance, with your sets:

http://x-wing.fabpsb.net/permalink.php?sq=r41m2n1n1d26l4p11r4a4r43m1m4g6f12e6e4m3e2e12g1e43p10

With your ships you are limited but thats ok. fly what you like and/or have. I hav e abuddy who only has tie fighters and all hes interested in flying is a tie swarm.

if you DO get a couple of more ties you can run a loaded out soontir with a mini swarm

or for rebels something like:

Ibtisam+fire control +ion +push the limit

Luke+r2d2+determination

Wedge+r2

Wedge, Luke, and Biggs are all game changing pilots. Flying two of those and a B-wing will be a good build with lots of punch.