|hummingbird mite and human hair|
One option is to call a local pest control company (exterminator) but this may not be your best option. Keep in mind that while many pest control companies will give you honest, expert answers to your questions their bias, their business, is to sell treatments not information. In the worst case they may sell you treatments that are not entirely necessary.
Your best option (in the US) is to contact your local Cooperative Extension office (see this page and click on the "Locate Extension offices near you" link at the top of the page). Every county has an Extension Office that serves to connect the local community to the subject matter specialists at the state agricultural university. The Extension office can get you in touch with experts at the university that can assist you with your bug questions, and these services are usually free. Many states maintain an "Insect Clinic" to which bug samples can be submitted for identification.
One caveat - Extension can be slow especially during the spring and summer when most of their staff time is consumed by commercial agriculture clients.
What if you want to do it yourself?
You'll need a good hand lens (magnifier) and some reference guide books to start (see our suggestions for insect guides and control here). Nowadays most bug questions can also be answered with resources available online if you know where to look.
|tick under flashlight light|
Unfortunately the cameras in cell phones are not as useful because they typically don't focus close enough. If you need more light on your subject an ordinary household flashlight works well (see photo of tick).
Online "bug identification" resources
AllExperts - a free Q&A-type site with experts in a wide range of areas. Digital images can be attached to submitted questions. I volunteer here in the Entomology (Insects/Spiders), Pests, and Pest Control sections but I only accept 1 question/day in each section.
BugGuide - a large database of images catalogued taxonomically. An excellent resource if you have a pretty good idea of what you are looking for and just need an image for comparison. Does not accept images for id but you can post an image which other users may comment on.
LivingWithBugs - this is my own site about home and garden bugs. I offer a fee-based (currently $20) Insect Id Service where I use your clear images to render an id and include control suggestions where needed. The "added value" over AllExperts is that I can tailor control recommendations to your specific needs, there's no daily limit to the number of questions I answer and I may be able to respond faster to a question coming through the 'Bugs site.
What'sThatBug - images can be submitted for id but not all submissions are accepted because of their limited staff. Excellent photos for comparison but like BugGuide you'll need to know what you are looking for.