There are only a few posh clubs where gigs are organised and these are mostly in french. However hotel bands perform almost everyday in most hotels. Oldies and some famous songs are the most common themes played in both English and French.
Well there are not many instrument shops in Mauritius.
it depends on which instrument ure playing : drums and guitars e.t.c there are J kalachand and Damoo both in P-Louis the city for basic kits. The other kits are found on catalogue and u'll need to order. Costs a lot more and takes a long time (usually 1 month or so)
A few studios. Not that high tech equipped but most local bands release some very good records of segga /raggae locally. The quality is good. haven't got a clue about the cost though.
AS u said the 1800RsMU can get u lessons for a month twice a week for guitar and drumming PRIVATE. Dunno for the rest.
I tried to help am not a huge music fan
here are some links at the bottom of this link itself :p