READ OUT LOUD. Choose which marked text you prefer to practice with - macrons in verse form, or macrons in prose order, or accent marks in prose order, or focusing on the meter. You will find materials for all of these options below. :-)
VERSE MACRONS. Here is the verse text with macrons:
Musca caput calvī studiō turbāverat ācrī;

Musca levis rīdēns tantō magis hunc stimulābat,

Calvus ait: Quia mē rīdēs, mē caedere cōgis;

Dixit, et īnstantem violentō percutit ictū;

Hinc minimus discat nōn infestāre potentem,

PROSE MACRONS. Here is the same text with macrons written out in prose word order:
Musca calvī caput studiō ācrī turbāverat; cuī cēdēns calvus saepe eam fugārat, tantō magis musca levis, rīdēns, hunc stimulābat quō magis ille caput mutilum caedēbat. Calvus ait: Quia mē rīdēs, mē caedere cōgis; multotiēns caedam quō semel intereās. Dixit, et īnstantem ictū violentō percutit; musca sordida fuit attrītā saniē . Hinc minimus discat nōn infestāre potentem, quī subitō pūnit quod ipse diu tulit!
STRESS (ACCENT) MARKS. Here is the prose text with accents, plus some color-coding for the words of three or more syllables (blue: penultimate stress; red: antepenultimate stress):
Musca calvi caput stúdio acri turbáverat; cui cedens calvus saepe eam fugárat, tanto magis musca levis, ridens, hunc stimulábat quo magis ille caput mútilum caedébat. Calvus ait: Quia me rides, me caédere cogis; multótiens caedam quo semel intéreas. Dixit, et instántem ictu violénto pércutit; musca sórdida fuit attríta sánie . Hinc mínimus discat non infestáre poténtem, qui súbito punit quod ipse diu tulit!
ELEGIAC COUPLET METER. Below I have used an interpunct dot · to indicate the metrical elements in each line, and a double line || to indicate the hemistichs of the pentameter line.
Musca ca·put cal·vī studi·ō tur·bāverat· ācrī;

Musca le·vis rī·dēns tan·tō magis· hunc stimu·lābat,

Calvus a·it: Quia· mē rī·dēs, mē· caedere· cōgis;

Dixit, e·t īnstan·tem vio·lentō· percutit· ictū;

Hinc mini·mus dis·cat nōn· infes·tāre po·tentem,

IMAGE. Here's an illustration for the fable (image source) by Richard Heighway:

What follows is an unmarked version of the prose rendering to faciliate word searches:
Musca calvi caput studio acri turbaverat; cui cedens calvus saepe eam fugarat, tanto magis musca levis, ridens, hunc stimulabat quo magis ille caput mutilum caedebat. Calvus ait: Quia me rides, me caedere cogis; multotiens caedam quo semel intereas. Dixit, et instantem ictu violento percutit; musca sordida fuit attrita sanie . Hinc minimus discat non infestare potentem, qui subito punit quod ipse diu tulit!