Strength 1 in Original Fallout 1

I'm not sure your character will ever really be good at combat with those stats. Your agility is good for ranged skills, but you're too weak to use guns properly. As mentioned, you could go full sneak and speech and try and do the game without combat as much as possible.

There are a couple of ways to increase your strength and luck.

Ways to increase Strength:

• T-51b power armor increases Strength by 3.
• The Brotherhood of Steel can perform an operation to increase Strength by 1, assuming the player can afford it.
• Buffout temporarily increases Strength by 2.
• Several perks increase Strength. Adrenaline Rush raises Strength by 1 when the player has less than 50% health. Gain perk can be used to boost Strength by 1. Some Perks raise Strength when checking for modifiers. Heave Ho! raises Strength by 2 for purposes of throwing weapons. Weapon Handling raises Strength by 3 for purposes of checking the minimum Strength needed to use a weapon.
• The Bruiser trait raises Strength by 2, but lowers the player's AP.

(http://fallout.wikia.com/wiki/Strength)

Ways to increase Luck

• Chuck in the Boneyard - Adytum can increase your Luck permanently by one point via the mysteries of the Tarot.

(http://fallout.wikia.com/wiki/Luck)