PTN LAG-Connectivity

Hi There! I  want to make a LAG-for sharing the BW between multiple ports as the master port is at peak utlization.I just want to ask for one master port how many slave ports can be added in a LAG so the BW can be shared also do all the ports need to be of same capacity like master and slave ports need to be either 1G or 10G or different capacity ports can be added in a single LAG too like 10G master port and 1G slave port?