Although definitely not for beginners,
HEPFAP has a lot of good material on heads-up limit play. No-limit is certainly different, but many of the concepts are similar.
In short, you don't want to play just a little looser and more aggressive. You need to play several orders of magnitude looser and more aggressive. Bottom pair is very strong, a pocket pair is a monster, and any ace is generally a hand you shouldn't mind taking to showdown.
Maybe even then 93 offsuit is one of the small percentage of hands you fold preflop, but if you put too many hands into this category you risk making your opponent's raise
automatically profitable.