Buying a existing e-commerce business

[manj]

Hello i need some help from you guys iv been running a successful subway franchise for a few years until i recently sold up i have always wanted to get into the e-commerce business i have found a website which is up for sale and i am intrested in purchasing it the only problem is i have been in the retail market n know all the ins n out about buying a retail business i am new to eccomrce and want to know what to ask or look out for when purchasing an existing website

the business has been running for 5 yrs
turnover is around 750k mark

ANY HELP WILL BE APPRECIATED