Thanks for your reply, it was helpful

Cloud accounting are online softwares that help you to create invoices and track incomes and expenses. I've since turned to DIY method using google spreadsheets. There's quite a few options if you google 'cloud accounting malaysia'. I dont know which one are the best yet. Some come with bookkeeping services and some come with tax agents too. It's quite remarkable.

i am using https://financio.co/ to do the bookeeping for my sole prop biz...
for how to claim expense for biz, just google more on it, there are a lot of info on it. For the expenses that can be treated as biz expenses, just create a record for it, and keep that receipt.

basically you can use this site to do all the statement(P&L and etc) which sufficient to show to lhdn in case they audit you.