Go with what you like and don't let others' opinions get you off track. If you're a modern quilter whose friends are all traditional quilters, don't give up what you love to go along. Do what you love!
More practically:
Test your 1/4" seam regularly and adjust it accordingly.
Take the time to properly press, both fabrics pre-sewing and seams once sewn.
Don't use directional fabrics as a beginner; give yourself time to understand how different blocks will look so you can figure out which way to cut your pieces.
Get the best tools you can within your price range. Splurge occasionally, especially when it's something you'll use daily.
Wherever your sewing spot is, be it kitchen table, corner of a room, or a gorgeous studio, set it up so that it's not a source of frustration.
Feel your fabric before you buy it. If it feels good to you, it doesn't matter where it comes from. If ordering online stick to brands you know and love.