As said by sir gandy, overall inspection. Ang i add ko nalang is
1. Since you are going for electric guitar, try to test the guitar in high gain and using distortion pedal and check kung static or too much noise. Since tele ang bibilhin mo bro expect that tele pickups is not good for heavy distorted effects thou it can! but there is a very low ceiling on how much distortion you could use.
2. Do some additional research, try to watch a youtube review of the item you are going to buy. This will give you an idea on how it should sound also how it looks like.
3. Knobs and volume pots check it out kung maluwag.
4. check if neck pickup / bridge pickup is working, neck and bridge pickup should sound different. kapag same ang sound means sira yung switch.
5. Huwag mahiyang mag test kasi sure bibili ka naman! goodluck bro balitaan mo kami