Having once fiddled with radios, I knew all about hook up in its literal sense, since hook-up wire and connecting components with wire was a part of the hobby in the old days. (The mess of cables behind my computer is just as bad- ditto, my 'entertainment' center).

So I went to J. E. Lighter, "Historical Dictionary of American Slang, vol. 2," to see about other meanings. (I think occasionally he posts here at Mudcat)

There are pages of hook words, but looking just at 'HOOK UP', and the first-found dates, these came up.
-To marry or get married- 1902
-To become sexually involved- 1895, Campus slang
-To meet, or join with- 1906
-(Hooked up- well-connected)
-A joining of forces- 1903 (hyphenated in orig. citation)
-To provide, or provide someone with.. 1983 (Hook me up with some bills; What do you need? I'll hook you up).
-To engage in kissing, petting and you know (see above)
-To handcuff 1985. California police slang.
-Hooked-up- 1933 Well-built, well-dressed, intelligent, etc.

I think many of these came from the first days of telephone, telegraph, etc., when wires were visibly strung along streets, tacked to walls inside buildings, etc., and people literally became hooked up.

Hook as slang would take up several threads.

HOOKER- A few of the slang uses-
-A Dutch fishing vessel- 1821 (hoecker-schip)
-A drink of liquor 1833
-A good friend 1827 (English, the whole hook, a reliable fellow)
-A thief (more commonly 'hook'). 18th c. or earlier. An 'angler'.
-A prostitute 1845. North Carolina, in Eliason, "Tarheel Talk."
1859, in Bartlett America, a resident of the 'hook', in other words a sailor's trull or prostitute, in the area of Corlear's Hook, New York City.
-A warrant for arrest 1934
-A stoolie or spy 1937 (labor)
-A trick, a catch, a concealed drawback. 1966 (I think much earlier than this).
-An element or inducement to stimulate interest 1968. (Advertising and entertainment industry).

If you can give references for earlier uses of these, please give me the details.