Don't really worry about them. You're better off just hitting them. Then hitting them again.
Ahh bummer. Always have it pictured in my imagination a lot different than just punch, and punch again. But that seems to be the case in a lot of RPGs.
You do have some more options as an adept, if you take the powers for them. Those aren't in the core book, though, and you don't
need them to start out - you can pick them up later, once you know the basics (the basics will cost enough anyway).
I also wouldn't agree with called shots not being worth it. They give a nice and not-too-complicated array of possibilities in combat, from doing extra damage to hindering your opponents (at the cost of less chance to hit). I'd agree that you don't have to worry about that
now, since those can wait until you're familiar with the basic system. They're options available to anyone, so you don't have to worry about them during chargen.
I was planning to have both high Speed and Strength, and a bit of Stealth, but wanted to be a fast and strong martial artist.
You'll need a high AGI to be a decent combatant anyway and STR to be good at unarmed; luckily, movement speed and stealthyness depend on those two. AGI determines base speed and stealth, and STR determines running. So all you need there is a small skill investment in Sneaking and Running.
Mind you, I've never really been impressed with unarmed adepts. Unarmed in general is rather underwhelming in damage. Like any melee fighter, you need to invest heavily in STR on top of AGI to break even with ranged combatants, but you'll be further behind even then the melee weapon fighters. Street Sams at least have (relatively) cheap STR augmentations, but those cost a
lot for Adepts, and Adepts can only ever get a STR+1 damage rating, where Street Sams top off at STR+3, and at an affordable cost. (Still less than melee, but hey). Unarmed does have the whole no weapons needed perk (which might make up for not being as effective if your GM restricts weapons a lot), and adepts get some nice perks street sams can't - but not enough to make it worthwhile, imho.