How did he acquire these rich assets?
In the usual way: by surmise.

It is _surmised_ that he travelled in Italy and Germany and around, and qualified himself to put their scenic and social aspects upon paper; that he perfected himself in French, Italian and Spanish on the road; that he went in Leicester's expedition to the Low Countries, as soldier or sutler or something, for several months or years--or whatever length of time a surmiser needs in his business--and thus became familiar with soldiership and soldier-ways and soldier-talk, and generalship and general-ways and general-talk, and seamanship and sailor-ways and sailor-talk.
Maybe he did all these things, but I would like to know who held the horses in the meantime; and who studied the books in the garret; and who frollicked in the law-courts for recreation.

Also, who did the call-boying and the play-acting.
For he became a call-boy; and as early as '93 he became a "vagabond"-- the law's ungentle term for an unlisted actor; and in '94 a "regular" and properly and officially listed member of that (in those days) lightly-valued and not much respected profession.
Right soon thereafter he became a stockholder in two theatres, and manager of them.

Thenceforward he was a busy and flourishing business man, and was raking in money with both hands for twenty years.

Then in a noble frenzy of poetic inspiration he wrote his one poem--his only poem, his darling--and laid him down and died: Good friend for Iesus sake forbeare To digg the dust encloased heare: Blest be ye man yt spares thes stones And curst be he yt moves my bones.
He was probably dead when he wrote it.