Hydraulic bleeding of brakes

[bensalvage]

Hi guys, new here so go easy does anyone have any useful tips on bleeding my brakes, had a few issues one being the caliper not being aligned correctly but that’s all sorted, I can’t seem to managed to get a good bleed in order to sharpen up the brakes, when I take out the nipple at the reservoir the fluid just pours out when removing the syringe, tried YouTube etc but to no avail I seem to loose pressure I have a whyte 801 with tektro brakes